Level 3
Adam has 150 blue stickers and red stickers.
60% of them are blue stickers and the rest are red stickers.
When Adam buys more blue stickers,
70% of the stickers are blue stickers.
How many stickers does Adam buy?
Level 3
Pierre had $77.70 more than Henry. After Henry had spent 23 of his money, Pierre had $114.50 more than Henry. How much money did Pierre have at first?
Level 3
Jamie had 126 pens. 23 of them were blue pens and the rest were red pens. After she had given away some blue pens, the ratio of the number of blue pens to the number of red pens became 4 : 3. How many blue pens did she give away?