Others Maths Puzzle

10 workers can construct 1000 meter wall with 3 bricks of
width in 15 days then what is one man capability?

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Others Other Question

1*2+3/6-9/*5= Mean and S.D of items are found to be 50 and 8 but while calculating those two items were taken as 45 and 55 instead of 54 and 46 fined correct S.D ?