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Posted by on Monday, September 27, 2010 at 11:13pm.

Find the number of Calories in a grapefruit and an orange.
(1) An orange has 15 more Calories than a grapefruit.
(2) Twenty oranges and ten grapefruit have 1800 Calories.

  • 8th grade math - , Tuesday, September 28, 2010 at 4:32pm

    G = Grapefriut calories, R = oRange Calories

    G = R - 15

    20R + 10G = 1800

    Substitute R - 15 for G and solve for R in second equation. Put that value in the first equation to find G. Check by putting both values in the second equation.

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