exam Maths Puzzle Numerical Ability

FIND THE VALUE | 3-A

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Q 33

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A GROCER MIXED GRAPE JUICE AT $2.25 PER GALLON WITH CRANBERRY JUICE AT $1.75 PER GALLON. HOW MANY GALLONS OF EACH SHOULD BE USED TO MAKE 20 GALLONS OF CRANBERRY/GRAPE JUICE WHICH WILL COST $2.10 PER GALLON? How do i write the expression as single quotient in which only positive exponents and or radical appear?

(x^2+4)^.5(2x)-(x^2)(.5)(x^2+4)^-.5(2x)/(x^2+4)