- [Voiceover] Li Min squeezed three lemons to make lemonade. She squeezed 42 millimeters of lemon juice from the first lemon. 36 milliliters of juice from the second lemon, and 45 milliliters of juice from the third lemon. How much lemon juice did Li MIn squeeze from her three lemons? Well we just have to add how many milliliters she got from each of them, add them all together. So from the first one, she got 42 milliliters 42, and short for milliliters I can write lowercase m for mili, and uppercase L for liters. 42 milliliters from the first lemon. 36 milliliters from the second lemon, and then 45 milliliters from the third lemon. So we can just add these three quantities together. So let's do that, let's add them together. So we're gonna get something in terms of milliliters. So let's go first to the ones place. Two plus six is eight, eight plus five is 13. 13 is three ones and one 10, so I could write that one 10 in the 10s place. So one plus four is five, plus three is eight, plus four is 12, so it's gonna be 12 10s. Which is the same thing as 120. So in total, Li Min squeezed 123 milliliters from her three lemons. Let's do another problem like this. Sarah poured five cans of motor oil into the container below. So this container below has 55, let's see this is halfway, it's filled up after she poured the five cans, and it's filled up halfway between 40 and 50, so this mark right here, this looks like that would be 45. So it's filled up to 45 milliliters. So she poured five cans, and those five cans combined ended up being 45 milliliters. All of the cans held the same amount of oil, and I guess we can assume that this container below was empty before she filled any of the cans in. So all of the cans held the same amount of oil. How many milliliters of motor oil were in each can? So she had five cans, so one, one can, two cans, three cans, four cans, and five cans. They each had a certain amount of oil in them. They each had a certain amount of oil in them. And when she put them all in, so let's say they each have a question mark of oil in them. So she had five cans, and they each had a question mark amount, say question mark milliliters of oil in it. And when you multiplied by five, when you put all five together you got 45 milliliters. You got 45 milliliters. So five times what amount of oil per can would get us to 45 in total? Well five times nine is 45. So this thing right over here, five times nine is 45. So Sarah had nine milliliters in each can, they each had the same amount, they say that. All the cans held the same amount of oil. So if she had nine milliliters in each one, notice, if in each of the five cans you had nine milliliters, five times nine is 45. So she had nine milliliters of motor oil in each can.