Question

4) An algebra class contains 30 students. Fortypercent of the students in the class are girls. Howmany boys are in the class?

Answer 1

1) Gathering the data:

30 students

40% are girls then 60% are boys

2) Calculating

30 ----100%

x ------ 60%

x= 1800/100

x= 18 boys

`\begin{gathered} (30)/(x)=(100)/(60) \\ 30\cdot60=100x \\ (1800)/(100)=(100x)/(100) \\ x=18\text{ boys} \end{gathered}`