 1104 people attended a park. 38 were adults. Some children left halfway and the ratio of the number of adults to the number of children became 6 : 7. How many children left the park halfway?
2 m
In a room, 57 of the girls wore cardigans. After 86 girls who wore cardigans left the room, the percentage of girls who wore cardigans decreased to 10%. How many girls in the room did not wear cardigans?
2 m
Fill in the blanks.
Number of boys at first is 30% of the children.
Number of boys is then increased to 40%.

1. Number of boys at first = _____ u
2. Number of boys in the end = _____ u
3. Increase in the number of boys = _____ u
4. Number of children in the end = _____ u
4 m
At a stadium, there were 40 children from Club W and 10% more children from Club X. Some children from Club X left and the ratio of the number of children from Club W to the number of children from Club X became 5 : 2. How many children from Club X left?
2 m
Fill in the blanks.
Number of boys at first is 40% of the children.
Number of boys is then decreased to 30%.

1. Number of boys at first = _____ u
2. Number of boys in the end = _____ u
3. Decrease in the number of boys = _____ u
4. Number of children in the end = _____ u
4 m
At a supermarket, 20% of the fish were guppies and the rest were dory fish. 40% of the dory fish were sold. What was the ratio of the number of dory fish to the number of guppies in the end?
2 m
The ratio of kiwis to watermelons is 2 : 5. If 304 watermelons were added, the ratio of kiwis to watermelons will be 3 : 17. How many kiwis are there?
2 m
The ratio of coconuts to mangosteens is 2 : 7. If 348 mangosteens was added, the ratio of coconuts to mangosteens will be 2 : 11. How many more mangosteens than coconuts are there in the end?
2 m
Fill in the blanks.
The ratio of Adam's stickers to Bryan's stickers is 2 : 3.
The ratio of Adam's stickers to Bryan's stickers becomes 1 : 2.

1. Whose number of stickers has not changed? Give the answer in number. (Eg Adam = 1; Bryan = 2)
2. Number of stickers that Bryan has = _____ u
3. Change in the number of stickers that Adam has = _____ u
4. 1 u = _____
3 m
Fill in the blanks in whole numbers or decimals.
2 boys, Adam and Bryan, share some stickers.
Bryan has 20% of the total.