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Vlada [557]
3 years ago
6

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.
Mathematics
1 answer:
Afina-wow [57]3 years ago
4 0

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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