Final answer:
To find the number of singles Andrelton must have, subtract the number of doubles, triples, and home runs from his total at-bats. Then, subtract that value from the total number of at-bats.
Step-by-step explanation:
To find the number of singles Andrelton must have, we first need to subtract the number of doubles, triples, and home runs from his total at-bats of 200. Andrelton has 12 doubles, 3 triples, and 8 home runs, so the total number of hits other than singles is 12 + 3 + 8 = 23. To find the number of singles, we subtract 23 from 200: 200 - 23 = 177.
Therefore, Andrelton must have 177 singles.