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The average age of a group o f10 students was 20. The average age increased by 2 years when two new students joined the group students who joined the group?

The average age of a group o f10 students was 20. The average age increased by 2 years when two new students joined the group students who joined the group? Correct Answer 32 years

দেওয়া আছে, 10 জন ছাত্রের গড় বয়স = 20 ∴ 10  জন ছাত্রের গড় বয়স = 10 × 20                                          = 200 বছর আবার, 2 জন নতুন ছাত্র আসার পর , 12 জন ছাত্রের গড় বয়স = (20+2) বছর ∴ 12 জন ছাত্রের মোট বয়স = (12 × 22 ) বছর নতুন ২ জন ছাত্রের মোট বয়স = (264 - 200)                                                = 64 বছর ∴ 2 জন ছাত্রের গড় বয়স = 64/2 = 32 বছর  

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