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Maths Puzzle
Numerical Ability
how many gallons of salt must be added to 40 gallons of a 20% salt sollution in order to get a 30% sollution
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Tom has 75 coins in a bank, consisting only of nickels and dimes. If the value of the coins is $5.95, how many of each kind of coin does he have?
Solve as a system of equ
Here is my first problem:
The Scott Paper Company wishes to make a closed rectangular box that uses 173 square inches of material. If the base must have a length that is 2.1 tim