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Linear Equations in Two Variables

SAT Math· difficulty 5/5

100 mL of 40% saline must be made into 25% saline by adding water. Water (mL) needed:

  • A

    6060

    check_circle
  • B

    5050

  • C

    7575

  • D

    4040

Explanation

0.40(100)=0.25(100+w)⇒40=25+0.25w⇒w=600.40(100) = 0.25(100 + w) \Rightarrow 40 = 25 + 0.25w \Rightarrow w = 60.

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