# SAT Math Multiple Choice Practice Question 490: Answer and Explanation

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**Question: 490**

**10.** Elsa has a pitcher containing *x* ounces of root beer. If she pours *y* ounces of root beer into each of *z* glasses, how many ounces of root beer will remain in the pitcher?

A. + *z*

B. *xy – z*

C.

D. *x – yz*

E. - *z*

**Correct Answer:** D

**Explanation:**

**D** Whenever there are variables in the answers, you should always plug in. Let's say *x* = 20, which means there are 20 ounces of root beer in the pitcher. Next, let's make *y* = 3 and *z* = 4. That means Elsa pours 3 ounces into each of 4 glasses, so she pours a total of 12 ounces. The question asks how much root beer remains in the pitcher, so your target answer is 20 – 12, or 8. Go to the answer choices and plug in *x* = 20, *y* = 3, and *z* = 4. In answer choice D, *x* – *yz* = 20 – (3)(4) = 20 – 12 = 8.