### Video Transcript

A machine pours 250 millilitres of
juice every four seconds. How many litres of juice does the
machine pour every minute?

We know that the machine produces
250 millilitres of juice every four seconds. We have to work out how many litres
of juice the machine produces in one minute. We know there are 60 seconds in one
minute. So we can think about the minute as
60 seconds. This makes it easier to work with
the numbers.

The first thing we need to
calculate is how much larger 60 is than four. How can we get from four seconds to
60 seconds? Half of 60 is 30, and half of 30 is
15. So 60 divided by four is 15. So we can multiply four by 15 to
reach 60. So we need to multiply 250
millilitres by 15 as well.

250 multiplied by 10 is 2500
millilitres. 250 multiplied by five equals 1250
millilitres. To all together, we have 3750
millilitres. We’re asked to give the answer in
litres. To help us convert the millilitres
to litres, we need to remember that there are 1000 millilitres in one litre.

The three in 3750 is the
thousands. So we know there are three
thousands. 3000 millilitres is equal to three
litres. So the machine pours 3.75 litres of
juice every minute. We found the amount of juice poured
in one minute by multiplying the amount in four seconds by 15. Once we had the amount in
millilitres, we converted the answer to litres. The machine pours 3.75 litres of
juice every minute.