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Linear Equations in One Variable

SAT Math· difficulty 5/5

A fruit stand sells apples at \1.20/lbandorangesat/lb and oranges at $0.80/lb.Acustomerbuys8lbtotalfor/lb. A customer buys 8 lb total for $8$. How many pounds of oranges?

  • A

    4

    check_circle
  • B

    2

  • C

    3

  • D

    5

Explanation

a+o=8a + o = 8, 1.20a+0.80o=81.20a + 0.80o = 8. Sub: 1.20(8−o)+0.80o=81.20(8-o) + 0.80o = 8 → 9.6−0.4o=89.6 - 0.4o = 8 → o=4o = 4.

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