Question

Class A has 25 pupils and class B has 28 pupils. Both classes sit the same maths test. The mean score for class A is 69. The mean score for both classes is 41. What is the mean score in the maths test for class B?

Answer 1

13

Explanation:

Mean would mean average, which in this case is
`(x+y)/(2)`

so your equation would look like
`(69+x)/(2)=41`

Next multiply both sides by to clear the fraction
`2*((69+x)/(2))`

to get
`69+x=89`

Subtract 69 from both sides
`69+x=82\\-69 -69`

you get
`x = 13`