book Maths Puzzle Logical Reasoning

Find the mean of first 8 odd numbers.

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book Other Question

A number when successively divided by 3,5 and 8 leaves remainder 1,4,and 7 respectively.Find the respective remainders if the order of the divisors be reversed. Q. Solve by cross multiplication method;
4x+7y=10 and 10x-35/2y=25