Level 2
Adam has 30 blue stickers and 70 red stickers.
After giving away the same number of stickers,
the ratio of the blue stickers and the red stickers becomes 1 : 3.
How many stickers are given away?
Level 2
Adam has 30 blue stickers and 120 red stickers.
After buying the same number of stickers,
the ratio of the blue stickers and the red stickers becomes 1 : 3.
How many stickers does he buy?
Level 2
The ratio of the number of blue stickers to red stickers is 5 : 2.
After Adam gives away another 10 blue stickers and 10 red stickers,
the ratio of the number of blue stickers to red stickers is 3 : 1.
How many stickers does Adam have now?
Level 3
In a jar, the ratio of the number of yellow balls to the number of purple balls was 1 : 3. Each time, 5 yellow and 7 purple balls were taken out of the jar. A while later, only 120 purple balls were left in the jar. What was the total number of balls in the jar at first?
