How many gallons of a 90% antifreeze solution must be mixed with 100 gallons of 30% antifreeze to get a mixture that is 80% anti
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Taking 4 out from first two terms, we will get
Now we divide the coefficient of x by 2 and add and subtract the square of the result, we will get
Distributing 4
Cancelling 9
And that's the required standard form.