exam Maths Puzzle Numerical Ability

how much wipping cream and 2% milk should be mixed to odtain 35 gallons of milk with 4% butter

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exam Other Question

If theta is an acute angle with cos theta=2/sqr rt 5, find the exact value of cos2 theta.

My possible answers are:
-3/5
-2/5
2/5
3/5 x/3+8=11 solve for x