18 shells because since Mary has 6 and Tina has 3 shells all you have to do is multiply 6 and 3 to get 18
Answer:
20
Step-by-step explanation:
20 - 9 = 11
I hope this helps
Yes I done it happy new year and a happy evening wish you a happy Christmas
20 2/3 hrs or 20 hours and 40 minutes cleaning his room. There are 30 months in may, so you multiply this by 2/3 to get 20 2/3 hrs
