book Maths Puzzle Numerical Ability

A farmer wants to mix milk containing 3% butter fat with cream containing 30% butter fat to obtain 900 gallons of milk which is 8% butter fat. How much of each must be use?

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how do i solve the eqation

xsquared + 61x -1422=0
cannot remeber what to do if i cannot factor??/
thank you
Question
In large data sets(1,000 or more values),the mean is always one of the data values. Why would this be true or false?