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Tyler is nine years older than his sister Tina. Twelve years ago, Tyler was four times as old as Tina. Find their ages now.

解答

Tyler is nine years older than his sister Tina. Twelve years ago, Tyler was four times as old as Tina. Find their ages now.

解答

Tyler^{'} s age is : 24

Tina^{'} s age is : 15

求解步骤

Translate the problem into an equation:

x - 12 = 4 (x - 9 - 12)

求解

x, x - 12 = 4 (x - 9 - 12) : x = 24

找到 age

Tyler^{'} s age is : 24

Tina^{'} s age is : 15

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