Question

the average number of shirts stitched by a tailor in 9 days is 58. how many shirts should he stitch on the 10th day, to increase, the average to 61?

Answer 1

avg = Total shirts / total days
58 = total shirts / 9 

He needs to make the average 61 in the 10 th day

61 = no of shirts / 10
61 *10 = number of shirts
610 = number of shirts 

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Answer 2

In 9 days 58 shirts on an average was stitched.
So sum total of shirts in 9 days = 9*58 = 522
By 10th day, the average should be 61
Hence sum total = 61*10 = 610
Hence shirts to be stitched on 10th day = 610-522 = 88

OR

Avg to be increased by '3' by 10th day.
Hence number of shirts to be stitched on 10th day = 61 + (3*9) = 88
Hope this helps