If Greg buys 5 shirts, 4 trousers and 2 ties, the total cost is $80. If Greg buys 7 shirts, 4 trousers and 2 ties, the total cost is $70. How much will it cost him to buy 2 trousers, 3 shirts and 1 ties?  Choose the correct answer
A) $37.5 B) $64 C) $75 D) $96 E) Cannot be determined
Solution: 5x+4y+2z=80 7x+4y+2z=70   adding both the equations= 12x+8y+4z=150   3x+2y+1z=37.5   ans $37.5
<result>A</result>
If Greg buys 5 shirts, 4 trousers and 2 ties, the total cost is $80. If Greg buys 7 shirts, 4 trousers and 2 ties, the total cost is $70. How much will it cost him to buy 2 trousers, 3 shirts and 1 ties?