Question

A college student earned $246, $288, $234, and $ 276 over a four week period. How much he earn during the fifth week to have average earnings of $255 for the five weeks?

Answer 1

the equation here is


`(246 + 288 + 234 + 276 + x)/(5) = 255`
If we multiply both sides by 5 we get

`246 + 288 + 234 + 276 + x = 1275`
Now if we add our like terms, we get

`1044 + x = 1275`
Now lets subtract 1044 from both sides to get a value for x

`x = 231`