Ashifur August 8, 2023 - 17:19
Problem: Robi was 4 times as old as his son 8 years ago. After 8 years, Robi will be twice as old as his son. What are their present age?

View all: PROBASY KALYAN BANK CASH OFFICER | WRITTEN QUESTION (MATH) SOLVE | 2014

Correct Answer: ans: Robi is 40 years and his son is 16 years.

Explanation:

Let, Age of Robi be = x

Age “Robi’s son be = y

For the question(x – 8) = 4 (y – 8)

=> x – 8 = 4y – 32=> x – 4y = – 32 + 8

=> x – 4y = – 24 —————— (i)

=> x + 8 = 2y + 16

=> x – 2y = 8 ————-~-—— (ii)

Now (i) — (ii)

=> 2y = – 32

y= 16

Putting the value of y in eqn (i)

x-4 x16 =-24

=> x = -24 +64

x=40

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