Subject
Bank Exam
Topic
Southeast Bank Ltd. - Probationary Officer - 2020 (15-02-2020)
The average age of a group of 10 students was 20. The average age increased by 2 years when two new students joined the group. what is the average age of the two new students who joined the group ?
The average age of a group of 10 students was 20. The average age increased by 2 years when two new students joined the group. what is the average age of the two new students who joined the group ?
ক)
22 yearsখ)
30 yearsগ)
40 yearsঘ)
32 yearsExplanation
প্রশ্নে বলা হচ্ছে, ১০ জন ছাত্রের গড় বয়স ২০ বছর । ২ জন ছাত্র ঐ দলে যোগ দেয়ায় গড় বয়স ২ বছর বেড়ে গেল । ঐ ২ জন ছাত্রের গড় বয়স কত ? 10 জন ছাত্রের বয়সের সমষ্টি = 10 × 20 = 200 বছর ( 10+2 )= 12 জন ছাত্রের গড় বয়স হবে = 20+2 = 22 বছর । ∴ 12 জন ছাত্রের বয়সের সমষ্টি = 12 × 22 = 264 বছর অতএব, 2 জন ছাত্রের বয়সের সমষ্টি = 264-200 = 64 বছর ∴ তাদের বয়সের গড় = 64/2 = 32 বছর ।Related questions
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