exam
Maths Puzzle
Numerical Ability
how many liters of a 10% acid solution must be mixed with a 50% acid solution in order to obtain 20 liters of a 30% solution?
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exam Other Question
In how many ways can 7 different colors be arranged in a row if the first is always red, the last is always blue and the middle one is always green?
18 / 2(3) + 4(5) / -22 + 12