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

Question

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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    2021-09-09T15:43:44+00:00

    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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