On an intelligence test, the mean number of raw items

On an intelligence test, the mean number of raw items correct is 231 and the standard deviation is 41. What are the raw (actual) scores on the test for people with IQs of
(a) 107.
(b) 83.
(c) 100
To do this problem, first figure the Z score for the particular IQ score; then use that Z score to find the raw score. IQ scores have a mean of 100 and a standard deviation of 15.