Answer:
Joy definitely does have enough soup for 22 people.
Step-by-step explanation:
Upper Bound: 285ml  turn it to 0.285l           10÷2=5
280ml
Lower Bound: 275ml turn it  to 0.275l
Upper Bound: 6.75l             0.5÷2=0.25
6.5 Litters
Lower Bound:6.25l
6.75÷0.275=24.54 or 25 Â
6.25÷0.285=21.92 or 22
22 < 25 Joy definitely does have enough soup for 22 people.