We have 171 kg rice costing 7 rs/kg.we have rice at 11 rs/kg and 2 rs/kg .then after mixing 11 rs/kg and 2 rs/kg rice. What is quantity of 11 rs/kg rice.

76

86

95

85

A = 11 rs/kg rice b = 2 rs/kg rice 11a= cost of 11 rs/kg rice 2b= cost of 2 rs/kg rice a+b = 171 11a+ 2b = 7 x 171 solving above equation a = 95 & b = 76

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