exam Maths Puzzle Numerical Ability

How many liters of water must be added to 8 liters of a 40% acid solution to obtain a 10% acid solution

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The student teacher ratio for Washington High was reported to be 27.5 to 1. If there are 42 teachers, then how many students are there?
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i need to find the area of a square with a side of 2 units.


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