book Maths Puzzle Numerical Ability

I am a two digit number. I am twice the product of my digits. What number am I

More importantly, how do I solve these types of questions?

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book Other Question

Working together, two pipes, A and B, can fill a tank in 4h. It takes pipe A 6h longer than pipe B to fill the tank alone. How long would it take each pipe alone to fill the tank? From a group of 6 men and 4 women, a committee of 3 is to be selected at random. Find P(at least 2 women).