Answer:
60
Explanation:
So deal with Judy then Harry
JUDY:
6 days x 4 t-shirts per day = 24 t-shirts
+ 7 t-shirts made before = 31 altogether
HARRY:
6 days x 3 t-shirts per day = 18 t-shirts
+ 11 t-shirts made before = 29 altogether
JUDY & HARRY:
Now combine both
31+29=60 t-shirts
Hope that helped! Any questions just ask! :)