self Maths Puzzle

Samrat Ashok had 10 chiefs, each of whom had to pay obeisance to him. The chiefs were numbered from 1 to 10 and the chief numbered N had to give him N gold coins each weighing 10 gms. The total weight of all coins received turned out to be 532 gms. Ashok's mantri suspected that one of the chiefs had submitted all coins weighing 20% less. The possibility of more than one chief cheating does not exist. Based on this information, we can conclude that
Ops: A. No one had cheated and the mantri was unnecessarily worried
B. Either chief number 6 or chief number 8 had cheated
C. Chief number 9 had cheated
D. It is impossible to find out who had cheated Samrat Ashok

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self Other Question

Albert and Fernandez have a two lap swimming race. Both start from opposite ends of the pool. On the first lap, the boys pass each other at 18 m from the deep end of the pool. During the second lap they pass at 10 m from the shallow end of the pool. Both go at constant speed but one of them is faster. Each boy rests for 4 seconds at the end of the first lap. What is the length of the pool?
Ops: A. 50 m
B. 44 m
C. 48 m
D. 64 m
There are two coins; one of radius r1 and the other of radius r2. The r1 coin is made to rotate around the circumference of r2. What is the number of rotations r1 will make around its own axis?

Ops: A. r2/r1
B. (r1+r2)/r1
C. (r2-r1)/r1
D. 2 * r2/r1