exam Maths Puzzle Numerical Ability

How many liters of a 60% salt solution must be added to 20 liters of a 12% salt solution to produce a 40% salt solution?

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exam Other Question

Jeanne is three times as old as Michel. The sum of their ages is 20 years. Find out their age now. Simplify each of the followingby combining like terms.

#36

x^2y + xy - y + 10x^2y - 2y + xy