12. In what proportion must water b...
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12. In what proportion must water be added to spirit to gain 20% by selling it at the cost price? (a) 2:5 (b) 1:5 (c) 3:5 (d) 4:5

11th - 12th Class
Maths
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45
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12 (2) Let the CP be ₹ 1 per L. SP of 1 L of mixture ( =₹ 1, ) Gain per cent ( =20 % ) CP of 1 L of mixture ( =left(frac{100}{120} times 1right)=₹ frac{5}{6} ) CP of ( 1 mathrm{L} ) of of ( 1 mathrm{L} ) water IIT Ratio of water and spirit ( =frac{1}{6}: frac{5}{6}=1: 5 )
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