can any1 explain the question to me?
This question asks how much pasta Mike will use next time he makes his dish. It's 4 serving for 1.5 cups pasta, so if we know how many servings he will make, we'll know how much pasta he needs.
1) He'll make half the number of servings next time as last time--but we have no idea how many he made last time! This doesn't help, it's insufficient
2) 6 cups of pasta last time lets us calculate the number of servings (it turns out to be 16, but it's not worth doing the math out if you can't do it in your head). But that tells us nothing about next time. Insufficient
Together) Just what we wanted. He's making half as much food last time as this time, which means that he needs half as much pasta--3 cups. Sufficient!
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