school
Acemy

Linear Equations in One Variable

SAT Math· difficulty 5/5

A chemist needs 200200 mL of a 35%35\% solution. She has unlimited supplies of 20%20\% and 50%50\% solutions. How many mL of the 50%50\% solution should she use?

  • A

    150

  • B

    120

  • C

    80

  • D

    100

    check_circle

Explanation

Let xx mL of 50%50\%. 0.20(200−x)+0.50x=0.35(200)0.20(200 - x) + 0.50x = 0.35(200). So 40+0.30x=7040 + 0.30x = 70, giving 0.30x=300.30x = 30 and x=100x = 100.

Want 10 more like this — adaptive to your weak spots?

Practice 10 like thisarrow_forwardPredict my AP score

Related questions

auto_awesomeAll Toolsquestion_answerHomework Q&Amenu_bookAP & SAT PreptimelineLearn Mode