How can you place parentheses in the expression 2 * 6 + 6 + 3 * 2 to make it a value of 60?

The tuition costs, c, for a local community college are modeled by c(h) = 250 + 200h, where h represents the number of credit hours taken. the local state university has tuition costs, s, modeled by the function s(h) = 300 + 180h. how many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

I’m still confused on how to work the percentages

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?