210.69 is the answer.
Sorry for not explaining my work, in a bit of a hurry. I had this question back when i was in school.
Hope this helps & good luck. :)
Try this solution:
1. if 1st number is 'x', the 2d number is 'y', then it is possible to make up the system of two equation according to the condition:

2. one number is 11, another number is 10.
Answer: n = 17
Step-by-step explanation: n= -68/-4= 17
Square root 50 does not belong....all of the other numbers are rational numbers. square root 50 is irrational.
900. You round up, because it is above 850. :-)