An Oil Company in the US does business with three suppliers in Toronto, Montreal, and Vancouver. One month the company ordered a total of 100 gallons from these suppliers. The delivery costs were $80, $50, and $65 per gallon for the orders from Toronto, Montreal, and Vancouver, respectfully, with total delivery costs of $5,990. The company ordered the same amount from Toronto and Vancouver. How many gallons of oil were ordered from each supplier? This is a three variable matrix problem, so I need x, y and z and three equations from the word problem.