? A road roller is 2 m long and has a radius of 42 cm. It costs Rs 0.20 for every
m2 of road levelled. If the total cost was Rs. 1584, then how many revolutions
did the road roller make?
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Answer:
1500 revolutions
Step-by-step explanation:
radius of roller = 42 cm = 0.42 m
area covered by roller in one revolution
= 2πrh (since roller is a cylinder)
= 2*(22/7)*0.42*2
= 5.28 m2
cost of rolling per m2 = 0.20 rupee
total cost of rolling = rupee 1584
area rolled = 1584/0.2
= 7920 m2
no. of revolution required to cover this area
= 7920/5.28
= 1500 revolutions
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