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2-step word problem: truffles

Sal solves a two-step word problem by drawing a picture and creating an equation. Created by Sal Khan.

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  • duskpin tree style avatar for user Natalie C. Quinonez
    i don't get it?
    (1 vote)
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  • aqualine seed style avatar for user Learning Isajoy
    what if qestons are above your level
    (2 votes)
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  • marcimus pink style avatar for user Adriana D
    Guys I am about to have the PARCC/IAR test what videos will help?
    (4 votes)
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  • mr pants orange style avatar for user Lotus Simply
    I wonder if 4x6=gx3 - if 3 is the half of 6, can I use the logic of 8x3 because I used half on one side and doubled on the other? The answer happened to be correct, but will my logic get me in trouble later on?
    (3 votes)
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  • aqualine ultimate style avatar for user Special King
    what is the answer Because I don't get it:

    my book has 79 pg. I have been reading 10pg each day there is 9 pg left how many days have I've been reading?

    someone explane it plzzzz
    (3 votes)
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    • piceratops tree style avatar for user Lyla Bennett
      alright yes, i can help you, first lets count how many tens does it take to get to 70? and you might say why not say 79 well that is taken care of becasue renember there are nine pages so lets count to 70 in tens, 10 20 30 40 50 60 70.so hhow many times did i count if its to hard just count the numbers i said and the answer is 7! i hope that answerd your question bye :)
      (3 votes)
  • ohnoes default style avatar for user Martin
    Mfg
    L3rmf leaf gh
    Lslsdk blsmd fb
    Lsdk fb
    Lskdnfb
    Skdnfblkd#mvosdkjgbsfibmdfokvm lkdf bbldmf vol dfvlm.dfkgm/. Dlvknbvknb. Ldvjnb. Ldjvnb. Djvnv pkdfn v kpdfn v pkdfn gbkdfnknfg bjkngnjkgn defensivenesses cfgfeg premenopausal c Jake sad. I’m going back to the house to go to the gym with the girls for the night so fdI’ll you guys are welcome to come in sand or do you want me to bring it up with the girls or if they are still in there too I’ll be home by the end of the week or Sunday night and I can bring them to you tomorrow o the one on Saturday or Friday I have to be in the room for a little while I have to go to the store and i and get some stuff and I’ll bring it back to the
    (3 votes)
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  • blobby green style avatar for user Thomas Kim
    The problems are very easy
    (3 votes)
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  • duskpin ultimate style avatar for user student.dnelson
    I wish there was a little harder way to get the answer but i did 4 times 6 and then divided by 3=8 people at the party
    (3 votes)
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  • duskpin ultimate style avatar for user Manju Biradar
    How do you keep the profile picture how you want it to be?
    (2 votes)
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  • blobby green style avatar for user Nikolas Vestal
    Essentially, We know 4 boxes of Chocolates were brought to the party.
    Each box contains 6 truffles.
    So we plug in the terms (4x6) = g + 3
    Because we know that 3 truffles were eaten each and G represents the number of guests.
    4(6) = 24 = g + 3
    24 = g + 3

    Since we need to evaluate for G we need to divide 24 by 3.
    x8
    3(24)
    -24
    0

    G = 8

    I may have not written it correctly but I assume this is basic algebra as well?
    (2 votes)
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    • leaf red style avatar for user ENDER HΛVEN『Free coding advice』
      Hold on here, 4x6 = g+3, right?
      so we need to solve:
      4 x 6 = 24
      24 is the same as g + 3, so 24-3 is equal to g.
      (in other words 24 - g should equal 3.)

      Therefore g = 21.
      because 21 (or g) + 3 = 24

      A variable is a letter assigned a value so it can be used in math, this value must be discoverable, or the variable is undefined, and cannot have any math done on it.
      (Also, capitalizing a variable ("g") turns it into a different variable: "G", which you said equals eight.)
      (2 votes)

Video transcript

Akshay brought four boxes of chocolate truffles to a party. Each box contains 6 truffles. Every guest at the party ate exactly 3 truffles, and there were none left over. How many guests must there have been at the party, must have attended the party? So we're trying to figure out how many guests must have attended the party. So let's actually define a letter to represent that. So let's say that p, or let's say g, g for guests, let's say that g is equal to the number of guests at the party. Then we could actually set up a relation between the number of guests, the number of truffles each guest ate, and then the total number of chocolates. So what was the total number of chocolates that we have at this party? Well, he bought 4 boxes. And each box contains 6 truffles. So the total number of chocolates at the party must have been 4 times 6. 4 times 6 truffles must have been the total number of truffles at the party. So let me write this down. This is the number of truffles total. Now, what's another way of thinking about the total number of truffles at the party? Well, you have g guests. So you have g guests. And each guest ate 3 truffles. So g times 3 is also going to be the number of truffles at the party-- number of truffles total. So these two things need to be equal to each other. So we could figure out what 4 times 6 is. And then we say, well, 4 times 6 is going to be some number. And g times 3 has to equal that same number. What must g be? So let's think about that step by step. So let's just visualize 4 times 6. So here is one box of truffles. We get 6 truffles. So it's 1 times 6, 2 times 6, 3 times 6, and 4 times 6. Or another way of thinking about 4 times 6, that's the same thing as 6 plus 6 plus 6 plus 6, which is 6, 12, 18, 24. So what we have here on the left hand side is 24. So we get 24. And now we know that this is going to be equal to the number of guests at the party. This is going to be equal to the number of guests at the party times 3. So what times 3 is equal to 24? And another way of viewing this is if g times 3 is equal to 24, that means that 24 divided by 3 must be equal to g. So one way of thinking about it, if I were to divide these truffles, these 24 truffles, into groups of 3, 3 for each guest, well, the number of groups I'm going to have will tell me the number of guests I have. So let's do that. So let's divide it into groups of 3. So let's see. Here is one group of 3, right over here. One group of 3. And now I have another group of 3, so two groups of 3. And now I have three groups of 3. Here's four groups of 3. Here is five groups of 3, six groups of 3, seven groups of 3, and eight groups of 3. So if I were to take 24 things and divide it into groups of 3, I get 8 groups. So we see that g-- let me get my pen tool. We see that g, or I could say 24 divided by 3 is 8, which must be equal to the number of guests at the party. The other way of thinking about it is I'm like, hey, some mystery number here, g, that I'm trying to figure out, the number of guests at the party times 3 is equal to 24. So what times 3 is 24? Well, you could just think about all the multiples of three. 3 times 1 is 3. 3 times 2 is 6. 3 times 3 is 9, 12, 15, 18, 21, 24. That's three times 1, 2, 3, 4, 5, 6, 7, 8. 3 times 8 is 24, so g must be equal to 8, or 8 must be equal to g. Or we had exactly 8 guests at our party.