Question : In a class, if 55% of the students are boys and the number of girls is 90, then find the number of boys.
Option 1: 135
Option 2: 120
Option 3: 198
Option 4: 110
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Correct Answer: 110
Solution : 55% of the students are boys and the number of girls is 90. So, $100-55=45\%$ students are girls. $\therefore$ Number of boys $=\frac{90}{45}×55=110$ Hence, the correct answer is 110.
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