Campus Maths Puzzle Numerical Ability Number System

9Q. The difference between outside and inside surface of cylindrical metallic pipe 14 cm long is 66 cm^2 . If the pipe is made of 99 cm^3 of metal, then what will be the outer & inner radii of the pipe?

a.) R = 2.125 cm, r = 1.375 cm
b.) R = 1.125 cm, r = 0.375 cm
c.) R = 2 cm, r = 0.375 cm
d.) R = 1.175 cm, r = 0.50 cm

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Campus Other Question

8Q. A can hit a target 4 times in 5 shots, B can hit 3 times in 4 shots & C can hit twice in 3 shots. When they fire together, what is the probability that at-least two shots hit the target?

a.) 5/6
b.) NOT
c.) 2/30
d.) 1/3 10Q. A man can row at 5 kmph in still water. If the velocity of current is 1 kmph & it takes him 1 hour to row to a place and come back, how far is the place?

a.) 2.5 km
b.) 3.6 km
c.) 2.4 km
d.) 3 km