exam Maths Puzzle Numerical Ability

How many liters of an 11% alcohol solution should be mixed with 60 liters of a 5% alcohol solution to obtain a mixture that is 7% alcohol?

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exam Other Question

How do you solve this problem, there are two consecutive odd numbers when multiplied equal the product 323. What are the two numbers? Find the expression that respresents its perimeter. A triangle has sides 3x + 7, 4x-9, and 5x+6