Question

the average mass of two girls is 42 kg. the mass of one of the girls is37 kg.what is the mass of the other girl

Answer 1

`(37 + x)/(2) = 42\\\\(2)(37 + x)/(2) = 42(2)\\\\37 + x = 84\\x = 84 - 37\\x = 47 kg`

Answer 2

47 Kg

Explanation:

Average:

Average is calculated dividing the sum of all the data by the total number of data.

Mass of one girl = 37 Kg

Let the mass of other girl = x Kg

Average mass of two girls = 42 Kg

`\sf (x + 37)/(2) = 42\\\\ x + 37 = 42*2\\\\x + 37 = 84`

x = 84 - 37

x = 47 Kg