1. The average marks of 50 students in a class is 72 and the average marks of boys and girls are 70 and 75 respectively. The number of boys in the class is
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By: anil on 05 May 2019 02.18 am
Given average marks of 50 students in a class is 72. Then total marks is given by, T = 50 x 72 = 3600 If total number of boys are B then total girls will be (50-B). And also average marks of boys is 70 and that of girls is 75. Then equation can be written as,
T = 70(B) + 75(50 - B) $$Rightarrow$$ 3600 = 70B - 75B + 3750 $$Rightarrow$$ 5B = 150 $$Rightarrow$$ B = 30 Hence, option D is the correct answer.
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T = 70(B) + 75(50 - B) $$Rightarrow$$ 3600 = 70B - 75B + 3750 $$Rightarrow$$ 5B = 150 $$Rightarrow$$ B = 30 Hence, option D is the correct answer.