of total sugar was drink by humming bird
Solution:
Given that,
When the Mario kept the humming feeder on Friday it had 
 cup of sugar water
When he sees on Monday, it had only 
 of sugar water
So, this means the water is consumed by the humming bird will be the difference of the two values:-

On solving we get,


Hence, the amount of sugar water consumed is 
 of total sugar at the starting