Since he already got 1 C, he can only have 3 more. Since x has to be <em>less than 4</em>, that rules out B and D instantly. A is ruled out because x can't be equal to 4 since you need less than 5 C's to get into UGA.
Its 59 you subtract 65-6 since you cant take 5 from six you will subtract 10from the 65 add it to the 5 witch is 15 15 minus 6 is 9 then bring down the 5 its 59