exam Maths Puzzle Numerical Ability

0.3x-0.2y=4
0.2x+0.5y=-3

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A specific brand of bike comes in two frames, for males or females. Each frame comes in a choice of two colo In Advanced Word 45 students earned an A on the test, 30 students earned a B, 10 students earned a C, and 6 students earned a D. If 4% of the students earned an F on the test, how many students earned an F? What percent earned A?