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The ratio of boys and girls is 3:4. If there are 28 students in a class, how many are the boys?
  1. 12
  2. 14
  3. 16
  4. 18
Explanation
Ratio of boys : girls = 3 : 4  
Total parts = 3 + 4 = 7  
Total students = 28  
Value of 1 part = 28 / 7 = 4  
Boys = 3 parts = 3 x 4 = 12

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