Book Maths Puzzle

Sandeep's age after six years will be three-seventh of his father's age. Ten years ago the ratio of their ages was 1 : 5. What is Sandeep's father's age at present?

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Book Other Question

In how many ways can a team of 5 persons can be formed out of a total of 10 persons such that two particular persons should not be included in any team? Sachin's age after 15 years will be 5 times his age 5 years back. Find out the present age of Sachin?