Question 401587
Ann's age is seven-tenths of Bill's age. In 4 years Ann's age will be eight-elevenths of Bill's age. How old is Bill now?
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Equations:
a = 0.7b
(a+4) = (8/11)(b+4)
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Substitute for a and solve for "b":
(7/10)b+4) = (8/11)b + (32/11)
Multiply thru by 110:
77b + 440 = 80b + 320
3b = 120
b = 40
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Solve for "a":
a = (7/10)b
a = (7/10)40
a = 28
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Cheers,
Stan H.
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