A can contains 180 litres of rose milk at Rs.40.5 per litre. How much water which is free of cost must be added to this can so that the cost of rose milk reduces to Rs.30 per litre? (In litres)
Initial quantity = 180 L
Cost per litre = Rs.40.5
Total cost = 180 × 40.5
= 7290
Let x litres of water be added.
New quantity = 180 + x
New cost per litre = 30
Total cost remains same:
7290 / (180 + x) = 30
7290 = 30(180 + x)
7290 = 5400 + 30x
30x = 1890
x = 63 litres
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