In 10 years A will be twice old as B was 10 years ago. If A is now 9 years older than B. the present age of B?

A 19

B 39

C 29

D 49

Solution

Correct Answer: Option B

মনেকরি,
B এর বর্তমান বয়স = x বছর
A     "        "         "= x + 9 "

আবার,
10 বছর পরে A এর বয়স হবে = x + 9 + 10
                                             = (x + 19)
প্রশ্নমতে,
x + 19 = 2 (x-10)
⇒ x + 19 = 2x - 20
⇒ x - 2x = -20-19
⇒x=-39
⇒x=39

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