A tank holds 126 litres of water .At present ,it is 35% full. How many litres of water must be put into it so that it is 60% full?
Ans.=90 Litres But how????
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35% of tank capacity =126 ltr
so,1%of capacity =126÷35=3.6 ltr
60% of capacity=3.6×60=216
additional water =216-126=90
so,1%of capacity =126÷35=3.6 ltr
60% of capacity=3.6×60=216
additional water =216-126=90
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