Mensuration Practice Test 3

Question : 12 of 40

Marks: +1, -0

A rectangular lawn measuring 60 m × 40 m has two roads, each 5 m wide running in the middle of it, one parallel to its length and the other parallel to its breadth. The cost of gravelling the roads at 80 paise per sq. m is:

Rs 400
Rs 425
Rs 380
Rs 385

Validate

Solution:

= Area of cross roads
= Area of rectangle PQRS + area of rectangle
LMNO − area of square TVUW
= 4 ×0 +56 ×0 −

5(5)^2

= 200 + 300 − 25
= 500 − 25
= 475

m^2

Cost of gravelling roads = 80 paise/sq.m.
=

{475×80}/{100}

= Rs 380

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