Linear Equations in One Variable

SAT Math· difficulty 4/5

A factory makes widgets at \4eachandgadgetsateach and gadgets at$7each.Totalrevenueeach. Total revenue$580$ from 100 items. How many widgets?

  • A

    60

  • B

    30

  • C

    40

    check_circle
  • D

    50

Explanation

w+g=100w + g = 100, 4w+7g=5804w + 7g = 580. Sub: 4w+7(100w)=5804w + 7(100-w) = 5803w=120-3w = -120w=40w = 40.

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