In what proportion must a grocer mix sugar at Rs.12 a kg and Rs.7 a kg so as to make a mixture worth Rs.8 a kg ?
using Allegation 
required proportion is 1:4 alternatively (12(x)+7(y)) / (x+y) = 8 12x +7y = 8x+8y = 4x= y x/y = 1/4 hence 1:4
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