exam Maths Puzzle Numerical Ability

If one month there is an increase of 50% and the next there is a decrease of 25% how much was the increase or decrease.

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exam Other Question

how would i do the problem 3x^2+4x=7 the length of a rectangle is 3 times the width. If the width were increased by 4 and the length remains the same the resulting rectangle would have an area of 231 sq.inches. find the dimension of the original.