Question

Robert's father is 4 times as old as Robert. After 5 years,father will be three times as old as Robert . Find Robert's age​

Answer 1

Correct & Verified answer:-

Let present age of Robert be 'x' then age of Roberts father = 4x ....(1)

and after 5 years.

Roberts age = x+5

Roberts father age = 3(x+5)

then 4x+5=3(x+5)

4x+5=3x+15

[x=10]

Hence, present age of Robert is 10 years & age of Robert's father is 40 years [Final ans].

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Answer 2

★ Answer :-

• Present age of Robert is 10 years .

★ Step-by-step-Explaination :-

• Let Robert's present age be x years .
• Then , Robert's father present age be 4x years .

Since 5 years ,

• Robert's age will be ( x + 5 ) years .
• Robert's father age will be 3( x + 5 ) years .

ATQ ,

$\rm \: 4x + 5 = 3(x + 5)$

$\rm \implies \: 4x + 5 = 3x +1 5$

$\rm \implies \: 4x - 3x = 1 5 - 5$

$\rm \implies \: \bf \: x = 10$

$\rm \: \therefore \: Present \: age \: of \: Robert \: is \: \bf \: 10 \: years$

Also , We can find Robert's father present age :-

• Robert's father age = 4x = 4 x 10 = 40 years .

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