Question

Mary spends 223
hours on math homework every week. She also spends 313
hours on art homework every week. How much time does Mary spend in total on math and art over 4 weeks?

Answer 1

Interpreting "223" and "313" as the mixed numbers 2 2/3 and 3 1/3:

2 2/3 = 8/3 hours, 3 1/3 = 10/3 hours.
Weekly total = 8/3 + 10/3 = 18/3 = 6 hours.
Over 4 weeks = 6 × 4 = 24 hours.

(If you actually meant 223 and 313 hours per week, then total over 4 weeks would be (223+313)×4 = 536×4 = 2144 hours.)