book Maths Puzzle Numerical Ability

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

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book Other Question

how many gallons of salt must be added to 40 gallons of a 20% salt sollution in order to get a 30% sollution My daughter says that her teacher did not explain how to convert unit multipliers.? I am not sure what she is asking. Can you help us please.
Thank you.