exam Maths Puzzle Numerical Ability

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?

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0.3x-0.2y=4
0.2x+0.5y=-3 96) Ventura Capital. Henry invested $ 12,000 in a new restaurant. When the restaurant was sold two years later, he received $ 27,000. Find his average annual return by solving the equation 12,000(1 + r)^2= 27,000.T hanks