The average marks scored by boys and girls in a class are 48 and 32, respectively. The total marks obtained by the entire class is 1680, with 40 students in total. How many boys are there in the class?
Average marks of all the students = 1680/40 = 42 Applying Alligation we get 
Number of boys in the class = 5/8 × 40 = 25
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