Answer:
84
Step-by-step explanation:
Because 3 people are making 21 shirts
If there were 12 people then your timesing the answer by 4 so 21=3 people so whats 3 people x 4=12 so then times the shirts by 4
Whats 21 x 4=84 so there is your answer.
Hope it helps have a great day:)
