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Answer: About $60,000,000,000,000$ litres
$6$ litres per minute
$6\times60$ per hour
$6\times60\times24$ per day
$6\times60\times24\times365.25$ per year
$6\times60\times24\times365.25\times20,000,000$ total
This can be approximated by:
$\begin{align}6 \times 60 \times 20 \times 400 \times 20,000,000 =& 2,880,000\times 20,000,000\\
\approx& 3,000,000 \times 20,000,000\\
&=60,000,000,000,000\end{align}$
Filling Morecambe Bay
Age 11 to 14
ShortChallenge Level 
Answer: About $60,000,000,000,000$ litres
$6$ litres per minute
$6\times60$ per hour
$6\times60\times24$ per day
$6\times60\times24\times365.25$ per year
$6\times60\times24\times365.25\times20,000,000$ total
This can be approximated by:
$\begin{align}6 \times 60 \times 20 \times 400 \times 20,000,000 =& 2,880,000\times 20,000,000\\
\approx& 3,000,000 \times 20,000,000\\
&=60,000,000,000,000\end{align}$
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.
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