exam Maths Puzzle Numerical Ability

Divide.

7x to the 5th power y to the 5th power - 21x to the 4th power y to the 4th power + 14x to the 3rd power y to the 3rd power OVER 7x to the 3rd power y to the 3rd power

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exam Other Question
How many gallons of a 4% acid solution should be mixed with 20 gallons of a 10% acid solution to obtain a mixture that is 5% acid? 8x - 6 = -48