book Maths Puzzle Numerical Ability

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?

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book Other Question

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? how do you do the steps to this problem? 3x=x/2+10