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Popular Word Problems >

Write the equation used to solve the following problem. Robert’s father is 4 times as old as Robert. After 5 years, father will be three times as old as Robert. Let x= Robert's age

Solution

W r i t e t h e e q u a t i o n u se d t o so l v e t h e f o ll o w in g p ro b l e m . ​ ​ R o b er t ’ s f a t h er i s 4 t im es a s o l d a s R o b er t . ​ A f t er 5 ye a rs, f a t h er w i ll b e t h ree t im es a s o l d a s R o b er t . ​ ​ L e t x = R o b er t^{'} s a g e

Solution

Robert^{'} s age is : 10

Father^{'} s age is : 40

Solution steps

Translate the problem into an equation:

4 x + 5 = 3 (x + 5)

Solve for

x, 4 x + 5 = 3 (x + 5) : x = 10

Find age

Robert^{'} s age is : 10

Father^{'} s age is : 40

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