exam Maths Puzzle Numerical Ability

A family consists of a father, mother and some children. The mean age of the family is 18 years. Without the 38 year old father the mean age of the family decreases to only 14. How many children are there in the family?

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exam Other Question

Will someone please help me with this, this is my last problem, I just do not no HOW to come up with the percent of everything. For the first problem 'What % of the monthly budget one number is 12 more than the other. The larger number is 7 times the smaller number. Find the number.

thank you very much in advance!!!.