Subject
NSI নিয়োগ
Topic
জাতীয় নিরাপত্তা গোয়েন্দা সংস্থা (NSI) (সহকারী পরিচালক) - ০৮.১০.২০২১
5 years ago the ratio of father's age to son's age was 5:1 and 2 years later father's age will be 3 times his son's age. What is the ratio of their present age?
5 years ago the ratio of father's age to son's age was 5:1 and 2 years later father's age will be 3 times his son's age. What is the ratio of their present age?
ক)
5:6খ)
7:3গ)
10:3ঘ)
11:7Explanation
মনেকরি, 5 বছর পূর্বে পিতার বয়স = 5x বছর এবং পুত্রের বয়স =x বছর ∴ বর্তমানে পিতার বয়স = (5x+5) বছর এবং পুত্রের বয়স = (x + 5) বছর প্রশ্নমতে, 5x + 5 + 2 = 3 (x + 5 + 2) ⇒ 5x + 7 = 3(x + 7) ⇒ 5x + 7 = 3x + 21 ⇒ 2x = 14 ⇒ x=7 ∴ বর্তমানে পিতার বয়স 5×7+5 = 40 বছর বর্তমানে পুত্রের বয়স = 7 + 5 = 12 বছর ∴ পিতা ও পুত্র = 40 : 12 =10 : 3Related questions
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