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Linear Equations in One Variable

SAT Math· difficulty 3/5

A rectangle has perimeter 60 cm and length 6 cm more than width. What is the length?

  • A

    21

  • B

    15

  • C

    12

  • D

    18

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Explanation

2(L+W)=602(L + W) = 60 → L+W=30L + W = 30. With L=W+6L = W + 6: 2W+6=302W + 6 = 30 → W=12W = 12, L=18L = 18.

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