Question

mean marks of boys is 50, girls is 40,total 48.then what is percentage of girl​

Answer 1

Step-by-step explanation:

Let number of boys = x and number of girls = y ∴ [(50x + 40y)/(x + y)] = 48. ∴ 2x = 8y i.e. (x/y) = 4 ∴ [x/(x + y)] = (4/5) ∴ Percentage of boys   = [x/(x + y)] × 100 = (4/5) × 100 = 80%.Read more on Sarthaks.com - https://www.sarthaks.com/318747/the-average-marks-of-boys-in-a-class-is-50-and-that-of-girls-is-40