The cost of 4 kg onion, 3 kg wheat and 2 kg rice is Rs.60.The cost of 2 kg onion,4 kg wheat and 6 kg rice is Rs. 90. The cost of 6 kg onion,2 kg wheat and 3 kg rice is Rs.70. Find the cost of each item per kg by matrix method.

The cost of 4 kg onion, 3 kg wheat and 2 kg rice is Rs. 60 . The cost of 2 kg onion, 4 kg wheat and 6kg rice is Rs. 90 . The cost of 6 kg onion, 2 kg wheat and 3 kg ricę is Rs. 70 . Find cost of each item per kg by matrix method.

A dietician wishes to mix two kinds of food X and Y in such a way that the mixture contains atleast 10 units of vitamin A, 12 units of vitamin B and 8 units of vitamin C. The vitamin contents of one kg food is given below : One kg of food X cost Rs. 16 and one kg of food Y costs Rs. 20. Find the least cost of the mixture which will produce the required diet ?