Summer Maths

It's going to be hot, hot, hot this week. A bit cooler and cloudier on Friday but still warm.
So you'll be needing plenty of cool, refreshing drinks to keep you going.
Here's a maths challenge and you might want to think of 5 litres as being 5000 ml in order to solve it. That's the only clue we'll give you. Check back for the answer tomorrow.

Tuesday Update

A glass contains more than a mug.