SAT Math Multiple Choice Practice Question 519: Answer and Explanation

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Question: 519

18. If a, b, c, and d are consecutive multiples of 5, and a < b < c < d, what is the value of (ac)(db)?

A. –100
B. –25
C. 0
D. 50
E. 100

Correct Answer: A

Explanation:

A Because it is much easier working with numbers than with variables, let's plug in some consecutive multiples of 5. Let's say that a = 5, b = 10, c = 15, and d = 20. The question then asks for the value of (ac)(db). Using the numbers you just plugged in, this becomes (5 – 15)(20 – 10), or (–10)(10), which equals –100.

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