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## Algebra (all content)

### Course: Algebra (all content)>Unit 2

Lesson 10: Linear equations word problems

# Linear equation word problem: sugary drinks

Sal solves the following problem: Drink A with 40% sugar is mixed with Drink B to obtain Drink C which has 25% sugar. What is the percentage of sugar of Drink B? Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

• How does Sal come up with what should be in the third column for each of these problems? I understand the math well enough but don't think I would be able to come up with what should be in that column from the question.
• I don't know if you still need an answer, but here one is:
Sal is changing the 'percent of sugar' into a decimal number, and multiplying.
So for the first one, he takes 2 L(the first amount of drink), and multiplies it by .4 (for 40% sugar content) to get 0.8 L in the third column, for total sugar amount.
• I understood how Sal did it, but i still have lots of trouble making my own tables. Where can I get more table problems?
• Why is it that (at ) all of a sudden we add Drink A and B together? When did the problem say that we added the two drinks together and end up with C?
• Reread the problem statement. In the 2nd sentence it says (somewhat condensed): "he takes 2 liters of Drink A and ADDS 1.2 liters of Drink B". Then, in the 3rd sentence, the problem tells you that this new drink is Drink C.
Hope this helps.
• Is there an easier way to do this?
• When Sal is computing the 'amount' of sugar in the drinks, it isn't strictly necessary for figuring out this problem (or problems of this type) is it? The only columns he needed was drink volume, and sugar percentage?
• How can amount of sugar be in litres?
(1 vote)
• I don't really know, I am quite sure it's supposed to be measured in grams.