book Maths Puzzle Numerical Ability

the length of a rectangle is decreased by 3 feet, and the width is increased by 1 foot, forming a square region havig an area of 25 square feet. what is the area of the orginal rectangle?

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1. 4n+5=6n+7
2. 5p-9=2p+12 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