Carol H. answered • 09/23/17

Tutor

4.9
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Masters' Degree in Mathematics with 35 years of Teaching Experience

Let a = the number of adults on the trip

Let c = the number of children on the trip

a + c = 30 c = 30 - a

.50a + .25c = 12.25 Multiply both sides of this equation by 100.

50a + 25c = 1225

50a + 25(30-a) = 1225

50a + 750 - 25a = 1225

25a = 475

a = 19 adults

c = 30 - a = 30 - 19

c = 11 children