Level 2
A jar has 650 mℓ of water. A pitcher has 280 mℓ of water. How much more water must be added into the pitcher so that it has the same amount of water as the jar?
Level 2
Beaker A has 300 mℓ of water and Beaker B has 900 mℓ of water. How much water must be added into Beaker A so that it has the same volume as Beaker B?
Level 3
Kay and Nelly had to finish the same number of worksheets. Kay did 9 worksheets per day. Nelly did 6 worksheets per day. When Kay finished doing all the worksheets, Nelly still had 21 more worksheets to do.
How many days did Kay take to finish all her worksheets?