exam Maths Puzzle Numerical Ability

If the company shipped a total of 550 items last month, how many were shipped using second-day air freight? NEXT DAY AIR FREIGHT WAS 15% AND TRUCK WAS 45% AND SECOND DAY WAS 40%

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I am doing solution of systems of equations, and i have to determine weather each system of equations has one solution, no solution, or many solutions. By graphing and if it has on 10x - 1/4 = 9x + 3/8