Question

the cost of painting a wall of a rectangular room ar the rate of rs.50 par sq.m is rs.4200 if the ratio of length to the breath of a wall is 7 : 3 find the length of the wall.

Answer 1

hello mate here is your answer,

=> Cost of painting a wall per sq.m=Rs50

=> total cost of painting the wall or its

area = Rs 4200

=> Ratio given = 7:3

Formula of rectangular wall to be implemented::

Length x breadth

Consider the ratio numbers value as x

So 7x : 3x = 4200

=> 7x + 3x = 4200

=> 10 x. = 4200

=> 10x/10 = 4200/10

=> x = 420

=> length = 7(x) = 7(420) = 2940 m

=> breadth = 3(x) = 3(420) = 1260 m

Rate of painting wall per m = Rs 50

total cost given = 4200

So per m sq = 4200/50 = Rs84 m

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