A zoo train ride costs $3 per adult and $1 per child. On a certain day, the total number of adults (a) and children (c) who took the ride was 30, and the total money collected was $50. What was the number of children and the number of adults who took the train ride that day, and which pair of equations can be solved to find the numbers?
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The first equation will just be the sum of adults and children
a + c = 30
the second equation will be the costs of the train ride for adults and children
___ + ___ = 50
Can you fill in the blank?