SAT Math Multiple Choice Question 721: Answer and Explanation

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Question: 721

1. If Images and 2a + 4b = 20, what is the value of b?

  • A. 2.5
  • B. 4
  • C. 5
  • D. 15

Correct Answer: B

Explanation:

B

Algebra (systems) EASY

Since the question asks for the value of b, it makes sense to substitute for a so that we get a single equation in terms of b.

Second equation:

2a + 4b = 20

Substitute images

images

Simplify and combine:

b + 4b = 5b = 20

Divide by 5:

b = 4

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