A,B and C are three commodities. A packet contains 5 pieces of A, 3 of B and 7 of C costs $24.50 . A packet containing 2,1 and 3 of A, B and C respectively costs $17.00 The cost of a packet containing 16, 9 and 23 items of A,B and C respectively is......" and answer is $100
But i can't understand how the answer is derived. it is 3 variables in 2 equations! so isn't the info lacking?