3 years ago

The Smith family went to the theater

Mathematics

1 answer:

Ivenika [448]3 years ago

7 0

Answer:

3 adult tickets and 4 child tickets

Step-by-step explanation:

a + k = 7

a = 7 - k

12a + 9k = 72

12(7 - k) + 9k = 72

84 - 3k = 72

3k = 12

k = 4

a = 3

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