book Maths Puzzle Numerical Ability

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20 over x = 20 over x - 4 + 4 over x

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Good evening. I would like to ask u to solve me this problem.
I think this is a simple problem that i spent many of times to solve but i could not .
PLease would Find the lateral surface area of a right circular cylinder with radius 7 cm and height 24 cm

Find the volume of a square pyramid 13 m tall whose base measures 5 m on a side