Linear Equations in One Variable

SAT Math· difficulty 4/5

A test has multiple-choice (worth 2 points) and short-answer (worth 5 points) questions. Total questions = 30 with maximum score 90. How many short-answer questions?

  • A

    8

  • B

    12

  • C

    10

    check_circle
  • D

    15

Explanation

m+s=30m + s = 30, 2m+5s=902m + 5s = 90. Sub: 2(30s)+5s=902(30-s) + 5s = 903s=303s = 30s=10s = 10.

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