Level 3
Adam has some stickers
He gives away 13 and an additional 15 stickers away to Bryan.
He gives away 49 of the remainder less 10 stickers to Chris
and 35 of the rest to David.
Adam has 30 stickers left.
How many stickers does he have at first?
Level 2 PSLE
A bottle completely filled with water weighed 1.9 kg. After 23 of the water was used up, the bottle with the remaining water weighed 800 g. What was the mass of the empty bottle in grams?