Question

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Answer 1

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Answer 2

Dimensions in 1st step = (50×0.25×0.5)m

Volume of first step =6.25m³.

Dimensions of second step= (50×0.5×05)m

Volume of 2nd step =12.5m³.

Dimensions of 3rd step = (50×0.75×05)m

Volume of 3rd step =18.75m³.

d = 12.5 - 6.25

= 6.25

Now, we have a=6.25,d=6.25 and n=15

Sum of 15 terms:

S15 = 15/2 [2×6.25+14×6.25]

= 15/2 ×100=750.

Volume of concrete =750m³.

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