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A solid copper sphere of radius 6 cm is melted and recast into a wire of radius 0.1 cm. Find the length of the wire.
A144 m
B288 m
C360 m
D576 m
A train 240 m long passes a 260 m long platform in 25 seconds. What is the speed of the train in km/h?
A60 km/h
B72 km/h
C80 km/h
D90 km/h
The mean of 100 observations was calculated as 40. It was later found that an observation 53 was misread as 83. Find the correct mean.
A39.3
B39.7
C40.3
D40.7
The present age ratio of father and son is 7:2. After 15 years, the ratio becomes 2:1. What is the present age of the father?
A35 years
B42 years
C49 years
D56 years
Find the area of a circle inscribed in a square of side 14 cm. (Use pi = 22/7)
A144 cm²
B154 cm²
C196 cm²
D616 cm²
Find the compound interest on Rs. 5000 for 1.5 years at 10% per annum compounded half-yearly.
ARs. 775.625
BRs. 788.125
CRs. 800.00
DRs. 825.25
A motorboat whose speed in still water is 15 km/h goes 30 km downstream and returns in a total time of 4.5 hours. What is the speed of the stream?
A3 km/h
B5 km/h
C6 km/h
D8 km/h
A, B, and C can complete a piece of work in 10, 12, and 15 days respectively. In how many days can they finish it together?
A3 days
B4 days
C5 days
D6 days