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Maths Puzzle
Numerical Ability
how many liters each of two solutions containing 30% and 20% acid, respectively, must be mixed to prepare 50 liters of solutions containing 26% acid?
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book Other Question
Simplify the following. (-3w^2n)(2n^2)^4
Some dimes and pennies are in a stack.
They have a total value of $2.31.
How many dimes are in the stack if there are twice as many dimes as pennies?