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Популярное Word Problems >

Chris is twice as old as Don. Next year, the sum of their ages will be four times as much as Don's age last year. Find their present ages.

Решение

C h r i s i s tw i ce a s o l d a s Do n . N e x t ye a r, t h e s u m o f t h e i r a g es w i ll b e f o u r t im es a s m u c h a s Do n^{'} s a g e l a s t ye a r . F in d t h e i r p rese n t a g es .

Решение

Don^{'} s age is : 6

Chris^{'} s age is : 12

Шаги решения

Translate the problem into an equation:

2 x + 1 + x + 1 = 4 (x - 1)

Решите для

x, 2 x + 1 + x + 1 = 4 (x - 1) : x = 6

Найдите age

Don^{'} s age is : 6

Chris^{'} s age is : 12

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