Question

C 15.91 +8.32

D 15.91 +7.59
A science teacher has 0.4 liter of seawater. She gives each of her 22 students a
container and a 5-milliliter spoon. She then asks her students to put two spoonfuls of
seawater into their containers. How many milliliters of seawater will be left after all
22 students have filled their containers?
A 70
B 180
C 290
D 780
Also I think I did this, but forgot so now I’m very confused can you guys help. Thanks

Answer 1

General Idea:

We need to convert the liter to milliliter to find out how much the science teach has in ml.

`\text{1L}=\text{1000 mL}`

`\text{0.4L}=0.4*\text{1000 mL}=\text{400 mL}`

Capacity of a Spoon given below:

`\text{1 spoonful}=\text{5 mL}`

Each student asked to fill 2 spoonful, which means 10 mL of seawater is expected to be filled in their container.

`\text{Amount of seawater filled by 22 students}=`

`\text{Number of students} *\text{Amount}`
`\text{ of seawater filled by each student in their container}`

`=22*10 \ \text{mL}=220 \ \text{mL}`

Conclusion:

Number of milliliters of seawater that will be left after all 22 students have filled their container is given below:

`400 \ \text{mL}-220 \ \text{mL}= \boxed{\bold{180 \ mL}}`

Answer 2

Each student is given a 5-milliliter spoon, and they are asked to put two spoonfuls of seawater into their containers. Therefore, each student will take 10 milliliters of seawater from the teacher's 0.4-liter container.

The total amount of seawater taken by all 22 students will be:

22 students × 10 milliliters per student = 220 milliliters

Therefore, after all 22 students have filled their containers, there will be:

0.4 liters = 400 milliliters (since 1 liter = 1000 milliliters)
minus 220 milliliters taken by the students
equals 180 milliliters of seawater left

So the answer is B, 180 milliliters.