@K311Y,
yeah u can pm on here. And christkid this is how I solve it:
If you take 14 days to mean 14 shifts either morning or evening, then M+E=14. It states that she didn't work 15 mornings and 17 evenings, 15+17=32 shifts not worked. Then, you add the amount of worked shifts with with unworked shifts, which would be 15+M+E+17. Since M+E=14, the overall total of shifts would be 46. Since a day has 2 shifts, you divide that in half to get 23.