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 KCSE Mathematics Paper 1 Revision Exercise Set 3

A newly built classroom measuring 6.3m long, 4.5m wide and 3.2m high is to be cemented on the floor and all inside walls. The classroom has one door measuring 1.85m by 80 cm and four windows measuring 1.5 m by 70 cm each. Cementing materials costs sh 500 per square metre while labour costs
20% of the cost of cementation materials. Calculate
a) to one decimal place, the total surface area to be cemented.
b) the cost of cementing materials
c) the total cost of cementing the classroom.

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