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Denise is now 4 over 5 as old as her sister Deth. Four years ago, she was 3 over 4 as old as her sister. What are their present ages?

解答

Denise is now 4 over 5 as old as her sister Deth. Four years ago, she was 3 over 4 as old as her sister. What are their present ages?

解答

Deth^{'} s age is : 20

Denise^{'} s age is : 16

求解步骤

Translate the problem into an equation:

\frac{4}{5} x - 4 = \frac{3}{4} (x - 4)

求解

x, \frac{4}{5} x - 4 = \frac{3}{4} (x - 4) : x = 20

找到 age

Deth^{'} s age is : 20

Denise^{'} s age is : 16

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