<PRE><B>Question 1115194</B>
grandfather: g
Ben: b
g+4 = 5(b-1)
g+b = 72 subtract b from both sides: g = 72-b Use this value for g in the equation above:
g+4 = 5(b-1)
(72-b)+4 = 5b-5
72-b = 5b-9
81 = 6b
b = 13.5
g = 72-13.5 = 58.5
Ben is 13 1/2 years old and the grandfather is 58 1/2 years old
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Check:
g+4 = 5(b-1)
58.5+4 = 5(13.5-1)
62.5 = 62.5 Correct</PRE>