Marty is 31 years younger than 6 times his friend warren's age. the sum of their ages is less than 11.
what is the oldest age warren can be?

M = 6w - 31
m + w < 11

6w - 31 + w < 11
7w - 31 < 11
7w < 11 + 31
7w < 42
w < 42/7
w < 6

oldest age warren can be is 5...but I do not see how that is possibly because if warren is 5, then marty is : 6(5) - 31= 30 - 31 = -1

unless u make warrens age 5 1/2making warrens age 2...wait, that wont work because u need a whole number