book Maths Puzzle Numerical Ability

3x + 2
------ =7
2

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book Other Question

Please help, I can't figure this one out!

1) An open-top box is to be constructed from a 4 by 6 foot rectangular cardboard by cutting out equal squares at each corner and the fo I don't understand these kind of problem: 4 1/6 x
____ = ____
2 1/4 3/5