SAT/ACT Prep Practice Problems

SAT, ACT, New SAT, PSAT  and SAT Subject Test Practice Problems are provided for students of OptimalSATPrep.com and others.

An Algebra Problem for SAT/PSAT/ACT Prep. (Hard). Target Time. 20-40 seconds.

A  45 liter tank contains a solution comprising 20% coolant and 80% water. A900 liter container contains a mixture of 95% coolant and 5% water. How many liters of the tank's solution should be replaced by the equal amount of content from the container so that the tank solution will become 45% coolant and 55% water?

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