exam Maths Puzzle Numerical Ability

A plane flies 500 miles with the wind and 340 miles against the wind in the same length of time. If the speed of the wind is 28mph, what is the speed of the plane in still air?

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y=x+3
8x-7y=12 A dealer wishes to produces 300 gallons of oil worth $0.40/quart. He has oil worth $0.36/quart and oil worth $0.52/quart. How many quarts each should he mix?
____qts of $0.36