A milk man mixes milk with water in the ratio 7: 2 respectively. He has 81 litres of mixed milk. what is the
quantity of pure milk
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Answer:-
7:2=m:w
m+w=81
7w=2m, w=m*2/7
m+w=81
m+m*2/7=81
m*9/7=81
m=81*7/9=9*7=63
The answer is 63.
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