Number System
The sum of the present age of a father and a son is 60 years. Five years before, the age of the father was four times that of son. What is the present age of the son ?

21 years
18 years
25 years
15 years

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Number System
In how many different ways can 7 boys and 3 girls sit in a row such that all the three girls do not sit together ?

3386880
3086880
3186880
3286880

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