Question 80939
Let J = Joe's age now; Let M = Mary's age now
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Write an equation for each sentence:
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Joe is 28 years older than his daughter Mary.
J = M + 28
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In 12 years he will be three times as old as Mary is now,.
J + 12 = 3M
J = 3M - 12
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Using the 1st equation substitute (M+28) for J, find M
M + 28 = 3M - 12
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28 + 12 = 3M - M
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40 = 2M
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M = 20 is Mary's age now
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We know J is 28 yrs older; Joe is 48 yr old now