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In what ratio must a grocer mix two varieties of tea costing Rs. 15 and Rs.

20 per kg respectively

so as to get a mixture worth Rs. 16.50 per kg



Let us say that the grocer mixes x kg of the tea worth Rs.15/kg and y kg of tea worth Rs.20/kg. therefore he would get (x+y) kg tea worth Rs.16.5 kg.
hence ratio=7/3 
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