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Question 1:
Milk contains 20% water. What quantity of pure milk should be added to 75 litres of this milk to reduce the quantity of water to 15%? A. 25 litres
Feedback To have final mixture with water 15% means, milk = (100-15) = 85%
Pure milk is 100% milk, and in 75 litres of milk there is 80% milk so
Milk (75 litres).............................Pure milk (x litres)
80............................100
................85..................
15..........................5
3 : 1
So 75/x = 3/1
Solve, x = 25
Pure milk is 100% milk, and in 75 litres of milk there is 80% milk so
Milk (75 litres).............................Pure milk (x litres)
80............................100
................85..................
15..........................5
3 : 1
So 75/x = 3/1
Solve, x = 25
B. 30 litres
C. 18 litres
D. 10 litres
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