I need help with number 13

Answer:
21 Tables
52 Chairs
Combination of both: Sander can complete 15 sets of chair/table, Lather can complete 22 sets of chair/table.
Step-by-step explanation:
Lathe operator works 6 hrs/day or 360 minutes
Chairs: 360/8 = 45 ; Tables: 360/8= 45
Sander works 7 hrs/day or 420 minutes
Chairs: 420/8= 52.5= 52 ; Tables: 420/20= 21
or,
For the Lathe operator to complete one set of chair and table = 16 minutes
360/16 = 22.5= 22 sets
For the Sander to complete one set of chair and table = 28 minutes
420/28 = 15 sets.