Thank you for sending in your answers to this problem. Only a few of you explained how you worked it through - particularly clear solutions were sent from Serine, Rukiye from Ashmount School, Rhal and Nikhil at Buckingham College Prep, Oliver and Frederica, Mya and Ciara from Hotwells Primary School. Here is what Serine told us:Referring to the clues given, the first thing I looked at was Ahmed's because it gives the exact amount which is thousand millilitres. According to that number I can use it to find out the rest of the numbers.
Serine sent in a picture with the measuring cylinders labelled:
It's a good point about Harry's cylinder. We don't know whether the picture shows the amount before or after the accident, so your answer will depend on what you assumed.