Level 2
Some audience were at a soccer match. After 644 women and 2755 men left the soccer stadium, there were 421 audience left. How many audience were there at the stadium at first?
Level 2
There were 2500 students in a school. 678 students went out for an excursion and the rest remained in school. Of the students who remained in school, 789 of them were boys. How many girls remained in school?
Level 3
Shumin wanted to buy a doll that cost $9.85. However, she only had $6.95. Her mother gave her another $2.10. How much more money did she need to buy the doll?
