Question

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Answer 1

Volume of a brick = 0.00975 m³.

Explanation:

Volume of the wall = 63 m³

Cost to build the wall = 84000 Rs

Cost to prepare a brick = 13 Rs

Since, relation between cost of the wall is directly proportional to the volume of the wall

C ∝ V

C = kV

Here, k = Proportionality constant

k =
`(C)/(V)` = Constant

Therefore,

`(C_1)/(V_1)=(C_2)/(V_2)`

`(84000)/(63)=(13)/(V_2)`

V₂ =
`(13* 63)/(84000)`

= 0.00975 m³

Therefore, volume of a brick is 0.00975 m³.