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The average age of all the students of a class is 15 years. The average age of the boys of the class is 17 years and that of the girls is 12 years. If the number of girls in the class is 3 6 then what
- A48
- B50
- C52
- D54
Correct answer: D
Discussion 1
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0
CCommunity
54
Let the number of boys = x
∴ 17x + (12 x 36) = 15 x (x + 36)
17x + 432 = 15x + 540
17x - 15x = 540 - 432
2x = 108
Let the number of boys = x
∴ 17x + (12 x 36) = 15 x (x + 36)
17x + 432 = 15x + 540
17x - 15x = 540 - 432
2x = 108