NDA 2019 Mathematics question

The mean weight of 150 students in a certain class is 60 kg. The mean weight of boys is 70 kg and that of girls is 55 kg. What are the number of boys and girls respectively in the class?

• (A)75 and 75
• (B)50 and 100Correct
• (C)70 and 80
• (D)100 and 50