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By selling a watch for Rs. 450, a man loses 10%. At what price should he sell it to gain 20%?
ARs. 500
BRs. 550
CRs. 600
DRs. 650
A pipe can fill a tank in 10 hours. Due to a leak at the bottom, it takes 12 hours. How long will the leak take to empty the full tank?
A50 hours
B60 hours
C70 hours
D80 hours
The surface area of a sphere is 616 cm². Find its radius. (Use pi = 22/7)
A7 cm
B14 cm
C21 cm
D28 cm
The sum of the digits of a two-digit number is 9. If 27 is added to the number, the digits are reversed. What is the number?
A36
B45
C54
D63