Question

Joy makes 6.5 litres of soup, correct to the nearest 0.5 litre. She serves the soup in 280 ml portions, correct to the nearest 10ml. 22 people order this soup. Does Joy have enough soup

Answer 1

Amount of soup made by Joy = 6.5 liters and nearest to 0.5 liters is 7 liters

Amount of soup in each serving portion = 280 ml. As the last digit is zero, this will not be rounded off and nearest value will remain 280

Number of people being served = 22

So total consumption of soup for 22 people is =

`22*280=6160` = 6160 ml

In liters this is =
`(6160)/(1000)=6.160` liters

Hence, Joy has enough soup for 22 people.

Answer 2

Joy definitely does have enough soup for 22 people.

Explanation:

Upper Bound: 285ml turn it to 0.285 L 10÷2=5

280ml :

Lower Bound: 275ml turn it to 0.275 L

Upper Bound: 6.75 L 0.5÷2=0.25

6.5 Litters :

Lower Bound:6.25 L

6.75÷0.275=24.54 or 25

6.25÷0.285=21.92 or 22