Exam Maths Puzzle Numerical Ability Percentage

A trader bought some Apples. 4% of them were spoiled in transport, 10% of the remaining got rotten and sold 90% of good ones. If 540 Apples remained unsold, find the number of Apples that he bought?

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Exam Other Question

An alloy of zinc and copper contains the metals in the ratio 5 : 3. The quantity of zinc to be added to
16 kg of the alloy so that the ratio of the metal may be 3 : 1 is
5+3+2=151022
9+2+4=183652
8+6+3=482466
5+4+5=202541 then
7+2+5=?