Answer:
2/15 litre
Explanation:
There is 1 litre in total. Max used 1/5 litre.
1 - 1/5 = 4/5 litre
Then he used 5/6 of the remaining 4/5 litre. He would have 1/6 of 4/5 litre left.
1/6 * 4/5 = 2/15 litre
or
You could do 5/6 * 4/5 to find out how much syrup he used on Sunday and then subtract that from 4/5 litre. It will give you the same answer