Question

3) After 12 years, Pinaki shall be 3 times as old as he was 4 years ago. Find the
present age.​

Answer 1

Step-by-step explanation:

present age is x

3(x-4)=x+12

3x-12=x+12

2x=24

x=12

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Answer 2

Let Pinaki's age be x years

After 12 years = (x + 12)

4 years ago = (x - 4)

According to the question,

(x + 12) = 3(x - 4)

⇒ x + 12 = 3x - 12

⇒ 12 + 12 = 3x - x

⇒ 2x = 24

⇒ x = 24 ÷ 2

⇒ x = 12

∴ Present age = 12 years

Verification:

After 12 years, age = 12 + 12 = 24 years

4 years ago = 12 - 4 = 8 years

24 years = 3 × 8 years

24 years = 24 years

LHS = RHS

Hence Proved