Question

Robert's father is 4 times as old as
Robert. After 5 years, father will be
three times as old as Robert. Find
their present ages.

a. 5,20
b. 6,24
c. 20,80
d. 10,40​

Answer 1

Answer:

Let Roberts age be x. Then Roberts father's age is 4x. After 5 years their ages are (x+5) and (4x+5) respectively. x=10.

Step-by-step explanation:

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Answer 2

Given :-

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

To find :-

• Present ages

Solution :-

Let the present age of Robert be x then Robert's father be 4x

• After 5 years

→ Robert age = x + 5

→ Robert's father age = 4x + 5

According to question

After 5 years, father will be three times as old as Robert.

→ 3(x + 5) = 4x + 5

→ 3x + 15 = 4x + 5

→ 15 - 5 = 4x - 3x

→ x = 10

Hence,

• Present age of Robert = x = 10 years

• Present age of Robert's father = 4x = 40 years

Therefore,

• Correct option is (d)