book Maths Puzzle Numerical Ability

In June I purchased 300 shares of Oracle stock at $20 per share. In August I purchased an additional 400 shares at $25 per share. In November bI purchased an additional 400 shares

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solve the system using the subsitutin method....-2x+y=6 and 4x-2y=5 how do i do this? As shown on a travel map, one route measures 5 and 1/8 inches and the other 5 and 1/2 inches. If 1 inch represents 80 miles, how many miles difference in distance is there between