Question

1.Joe owns an automotive garage which does car service and mechanical repair. In one week, 18 cars had service or repair, 9 had services and 5 had both services and repair. How many cars had repairs?

Answer 1

14

Explanation:

You want the number of cars with repairs if 18 had service or repairs, 9 had service, and 5 had service and repairs.

Repairs

The total number of cars can be described by ...

service or repairs = service + repairs - (service and repairs)

18 = 9 + repairs - 5

repairs = 14

The number of cars that had repairs is 14.

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Additional comment

We have to subtract (service and repairs) because both "service" and "repairs" include that number.

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