Were gonna start by writing an equation (139+184+x)/3=170 because were adding a 3rd value to the average and x is going to be our value that were looking for. If you solve that, you get 187. Hope this helps.
First, add 139+184=323. Then multiply 170 to 3 to get the total number of points he must get to achieve that average. 170 multiplied to 3 gives you 510. Then subtract 500- (139+184)= 187. This is the number of points Ben must get in his third game to have an average of 170
