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40% of 20 gives us 8 boys (10% of 20 = 2, 2 * 4 = 8). 25% of 8 gives us 2 boys (8 / 4 = 2). 60% of 20 gives us 12 girls (firstly, 100% - 40% = 60%. Secondly, 2 * 6 = 12). 50% of 12 gives us 6 girls (12 / 2 = 6). 2 boys who wear glasses + 6 girls who wear
