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14 July, 12:03

Carla and Rob left a 20% tip after having lunch at a restaurant. The amount of the tip was $6. Carla's lunch cost $15. Write an equation you can use to find x, the cost of Rob's lunch.

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  1. 14 July, 15:35
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    Robs lunch cost is unknown = x

    and we know carla's cost 15 = 15

    x + 15 = total lunch cost

    now me know 20% is 6

    so 20% of total lunch cost is 6

    or

    (x+15) (.02) which is 20% of lunch and this is 6

    or

    (x+15) (.02) = 6 this is the equation to find x

    this is the answer, but for kicks lets solve it to to find the cost

    .2x + 3 = 6

    - 3 - 3

    .2x = 3

    /.2 /.2

    x = 15

    Robs lunch cost $15 too
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