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Linear Equations in One Variable

SAT Math· difficulty 3/5

Maria is twice as old as her brother Tom. In 5 years, the sum of their ages will be 40. How old is Maria now?

  • A

    10

  • B

    25

  • C

    15

  • D

    20

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Explanation

Let M=2TM = 2T. (M+5)+(T+5)=40(M+5) + (T+5) = 40 → M+T=30M + T = 30 → 2T+T=302T + T = 30 → T=10T = 10, M=20M = 20.

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