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A wheel has a radius of 21 cm. How many revolutions will it make to cover a distance of 1320 cm?
A5
B10
C15
D20
If the circumference of a circle is 88 cm, find its radius. (Use pi = 22/7)
A7 cm
B14 cm
C21 cm
D28 cm
A boat goes 16 km downstream in 2 hours and 16 km upstream in 4 hours. What is the speed of the boat in still water?
A4 km/h
B6 km/h
C8 km/h
D10 km/h
If 12 men can complete a work in 20 days, in how many days can 15 men complete the same work?
A12 days
B14 days
C16 days
D18 days
A article is bought for Rs. 450 and sold for Rs. 540. What is the profit percentage?
A15%
B18%
C20%
D25%