SOLUTION: At coffee house, man wanted 300ml of coffee. To this coffee he wanted pure cream added until the cream represents 20% of the total volume of the drink( cream and coffee. Not just 2

Question 768077: At coffee house, man wanted 300ml of coffee. To this coffee he wanted pure cream added until the cream represents 20% of the total volume of the drink( cream and coffee. Not just 20% of the 300ml). How much pure cream should be added?
Answer by josgarithmetic(39801) (Show Source): You can put this solution on YOUR website!
f is volume of cofFee
r is volume of cReam
total volume of both together = f+r.
want 0.20 cream/(cream&coffee)

Now, f=300 ml. and r is unknown. Find r.

ml. of cream
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