Level 2
Fill in the blanks.
Adam has twice as many stickers as Bryan.
Both give away 10 stickers each.
In the end, Adam has thrice as many stickers as Bryan.
Difference in the number of stickers between Adam and Bryan = _____ u
Number of stickers that Adam and Bryan have in the end = _____ u
Level 3 The number of boys and girls in a hall were in the ratio 2 : 7. After 15 boys entered the hall and half the number of girls left the hall, the ratio of the number of boys to girls became 1 : 1. How many children were there in the hall at first?