Question

The mean weight of 180 students is 50kg.the mean weight of boys is 60kg and girls is 45kg.find the number of boys and girls

Answer 1

Answer:

Step-by-step explanation:

Let the no. of boys be x .

so No. of girls = (180-x).

A/Q,  60 x + (180-x) × 45 = 180×50

⇒ 60 x + 180×45 - 45 x = 180×50

⇒ 15 x = 180 (50-45)

⇒ 15 x = 900

∴ x = 60

no. of boys = 60

''     '' girls = 120