Question
The number of boys in the lecture theatre was 57 that of the girls. There were 172 more girls than boys. After some girls had left the lecture theatre, the number of boys at the lecture theatre was five times the number of the remaining girls. How many girls left the lecture theatre?
4 m

Click button first when a symbol is required. X

The number of boys in the lecture theatre was 57 that of the girls. There were 172 more girls than boys. After some girls had left the lecture theatre, the number of boys at the lecture theatre was five times the number of the remaining girls. How many girls left the lecture theatre?