Video Transcript
If five liters of water is going to
be poured into 200-milliliter bottles, how many bottles will be used?
Let’s start by thinking about this
problem. Let’s imagine that we have our five
liters of water in five of these liter containers. If we then poured all of these five
liters of water into a number of different 200-milliliter bottles, how many bottles
will we need? It’s difficult to answer in this
format as we have quantities given in different units, ones in liters and the others
in milliliters. So we’ll need to use the conversion
that one liter is equal to 1000 milliliters.
This means that five liters is
equal to 5000 milliliters. And we can verify this in two
different ways. We can multiply our quantity in
liters by 1000 to get 5000. Or, as an alternative, we can
recognize that each of the one liters would be equal to 1000 milliliters, so five of
those would be 5000 milliliters.
Now we need to work out how many
200 milliliters there are in 5000 milliliters. We can do this by dividing 5000 by
200. This is equivalent to 50 divided by
two. And that’s equal to 25. So our answer is that we need 25
200-milliliter bottles.
We can check this by thinking about
how many bottles would be required for one liter of water. As each 1000 milliliter, or
one-liter quantity, has five lots of 200 milliliters, then each one liter will need
five bottles. Five lots of five bottles would
give us 25 bottles.
