Book Maths Puzzle Numerical Ability

For their marriage anniversary A and B called some couples. Out of them 23 couples have one child per couple with them. I found that 13 men were without any child and 20 women were also without any child.It is known that there were only couples are allowed for the unction
How many number of couples are present

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Book Other Question
remainder (6^7+17^6)/7 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.