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

dsuc.created: 2 years ago | dsuc.updated: 1 day ago

dsuc.updated: 1 day ago

19 years

29 years

39 years

49 years

Bangladesh Bank বাংলাদেশ ব্যাংক অফিসার ০২ -১২-২০২২ গণিত বয়স (Ages) শতকরা (Percentage) গড় (Average)

dsuc.explanation

857

common.best_ans:

Let B's present age = x years.

Then, A's present age = (x + 9) years

∴(x+9)+10=2(x−10)

⇔x+19=2x−20

⇔ x=39

1 year ago

2 0

Ritu

Let, B's present age is x year & 10 years ago he was (x-10)

After 10 years, A= 2((x-10), B= (x+10)

Now, 2(x+10)-(x+10)=9

Or, x=39 years.

2 years ago

0 1

Sharmin

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