The ratio of boys and girls in a class is 3: 2. If 10% of boys and 15% of girls failed in an examination, the percentage of passed students is:

75%

80%

88%

87.5%

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উত্তর: 88%

Let the number of boys and girls be 3x and 2x respectively. Total students = 3x + 2x = 5x Number of boys failed = 10% of 3x = 0.3x So, Number of boys passed = 3x - 0.3x = 2.7x Number of girls failed = 15% of 2x = 0.3x So, number of girls passed = 2x - 0.3x = 1.7x Total students passed = 2.7x + 1.7x = 4.4x Percentage of passed students = 4.4x / 5x x 100% = 88%

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