exam Maths Puzzle Numerical Ability

How many gallons of a 12% solution must be mixed with a 20% soltion to get 10 gallons of a 14% solution?

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exam Other Question

7sqrt7x+5sqrt7x

The instruction says to "simplify". Can someone show me how to do this one?

Thank you! The length of a rectangle is 3m more than 5 times the width.The perimeter is 126m find the length and width.