self Maths Puzzle

Find the least number when divided by 7 gives the reminder 6, when divided by 6 gives reminder 5, when divided by 5
gives reminder 4 and so on....

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self Other Question

Out of 55 eggs 5 are defective. what is % of defective eggs If there are 50 hens, 40 goats, 30 camels and some watching men. If number of legs are 640 more than that of heads. Then find the no. of watching men??