The cost of one adult's admission is $42.
2a + 4c = $196 equation 1
a - c = $14 equation 2
Where:
a -= cost of adult's ticket
b = cost of children's ticket
Make c the subject of the formula in equation 2
a - 14 = c equation 3
Substitute for c in equation 1
2a + 4(a - 14) = 196
2a + 4a - 56 = 196
6a = 252
a = 252÷6
a = $42
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