Level 2
A food stall used 50 ℓ of water on Monday and 12 ℓ more water on Tuesday than on Monday. How many ℓ of water did the class use on the two days?
Level 3
Mrs Chen sold 426 cupcakes on Monday. She sold 128 fewer cupcakes on Tuesday than on Monday. She sold 349 cupcakes on Wednesday. How many cupcakes did Mrs Chen sell on for the 3 days?