5a - 10*3 = 45
5a - 30 = 45
5a = 45 + 30
5a = 75
a = 15
(150 miles/week) x (1 gallon / 25 miles) x (3 $/gallon)
= (150 x 1 x 3) / (25) (miles-gallon-$ / week-miles-gallon)
= 18 $/week .
25 because 5 (the number of sticks) times 5 (the number of houses) equals 25
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