He incrased the distance in ap a=first term=11, d=common difference=8 what is given in the options is the sum of n terms sum of n terms of AP={2a+(n-1)d}(n/2) putting n=15,21 and 28 you will get options 1,III and V hence option4

A purchase clerk is checking stationery bought for the office. In all there are 90 blue, red and black, pens and pencils. He finds that there is the same number of red pens as blue pencils. There is the same number of blue pens as black pencils. There are twice as many black pencils as red or blue pencils. There are 6 more pencils than pens. How many black pens are there?

Answer is 6 There are 48 pencils and 42 pens. There are 24 Black pencils, 12 blue pencils and 12 red pencils. So, there are 24 blue pens and 12 Red pens. So, there are 6 black pens.

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