It all depends on the math question but usually you solve for x, then check it. Plug x back in and see if it works. But it all depends on the math problem
Well thinks of it as 10/10, so Cathy revived 1/5, so that means 3/10th then Zhong received 1/8 which is 2/10th. Stacy revived the average which it about 49% or 3/10. which can only mean Benny got 2/10!