Question

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 )

# 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

Solution