Question

there are 3 stairs steps as shown in the figure each stair step had width 25cm height 12cm and length 50cm bricks have been used in it I'd each brick is 12.5×6.25 ×4

Answer 1

Given : Dimension of each pair is width = 25 cm , Length = 50 cm and height = 12 cm .

We know volume of cuboid ( Here each step is in shape of cuboid ) = Length × Width × Height

Here , Dimension of first step : ( width = 25 cm , Length = 50 cm and height = 12 cm ) , So Volume of first step = 50 × 25 × 12 ,

Dimension of second step : ( width = 25 cm , Length = 50 cm and height = 12 + 12 = 24 cm ) , So Volume of first step = 50 × 25 × 24

And

Dimension of third step : ( width = 25 cm , Length = 50 cm and height = 12 + 12 + 12 = 36 cm ) , So Volume of first step = 50 × 25 × 36

So,

Volume of 3 stairs - step = 50 × 25 × 12 + 50 × 25 × 24 + 50 × 25 × 36 = 50 × 25 ( 12 + 24 + 36 ) = 50 × 25 × 72 = 90000 cm3

Also given dimension of a brick = 12.5 × 6.25 × 4 , So

Volume of a brick = 12.5 × 6.25 × 4 = 312.50

Then ,

Total number of bricks used = 90000312.50 = 288 ( Ans )
Hope this information will clear your doubts about topic.

Answer 2

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