exam Maths Puzzle Numerical Ability

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3x+18 greater then equal to 9 and 3x- 18 greater than less than minus 15

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exam Other Question

In a large class, 80 students took a test. When the test papers were rated, it was found that 10% of the students had A papers, 23% had B papers, 30% had C papers, 15% had D papers, and the rest failed. How many students failed the test? 9/16 to a percent

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