Question 581662
A group of 60 people attend a ball game. There were twice as many children as adults in the group. Write a system of equations that you could use to set up this problem, where "a" is the number of adults and "c" is the number of children in the group. Solve the system of equations for "c", the number of children in the group. 
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Equations:
a + c = 60
c = 2a
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Substitute for "c" and solve for "a":
a + 2a = 60
3a = 60
a = 20 (# of adults)
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Solve for "c":
c = 2a
c = 2*20 = 40 (# of children)
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cheers,
Stan H.