SAT Math Multiple Choice Practice Question 490: Answer and Explanation
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
D. x – yz
E. - z
Correct Answer: D
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.