I forgot how to do this, can someone help

Water flows at a steady rate from a tap. its takes 40 seconds to fill a 4 litre watering can from the tap. the rate at which water flows from the tap is halved. complete: 4 litres into cm3

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

When rolling 26 sided number cube what are the chances some of the role will be seven