6.5 liters of soup, correct to nearest 0.5 liters.
⇒ Lower bound = 6.450 liters = 6450 ml
⇒higher bound = 6.549 liters = 6549 ml
She served soup in 280 ml, correct to nearest 10ml
⇒ Lower bound = 275 ml
⇒higher bound = 284 ml
To ensure that we definitely have enough, we take the lower bound of the soup divided by the higher bound of each serving:
6450 ÷ 284 = 22.7 servings.
Answer: Joy definitely does have enough soup