Level 3
One minute ago, 80% of the students in a parade square were girls. 143 more students entered the parade square. As a result, the number of girls increased by 40% and the number of boys increased by 60%. How many students are in the parade square now?
Level 3
Eva's salary is 30% more than Betty's salary. When their salaries are increased by 60%, their combined salaries will be $11040. How much was Eva's salary before the increase?
Level 3
At a theme park, each adult ticket cost $25
and each child ticket cost $12.
On Monday, the number of adult tickets sold was 120 less than the number of child tickets.
On Tuesday, the number of adult tickets sold decreased by 10% while
the number of child tickets sold increased by 30%.
If a total of 816 tickets were sold on Tuesday,
how much money was collected on Monday?
Level 3
A basket contained violet and purple buttons. There were 60% more violet buttons than purple buttons. When 248 more buttons were poured into the basket, the amount of violet buttons increased by 40% and the amount of purple buttons grew by 60%. How many buttons were in the basket at first?