Answer:
The number of girls in Irene's class is 12.
Step-by-step explanation:
We can set up an equation.
Let x=the number of girls in Irene's class, and rewrite 30% as [tex]\frac{30}{100}[/tex], (simplified to [tex]\frac{3}{10}[/tex]
[tex]\frac{x}{40} = \frac{3}{10}[/tex]
Cross multiplying gives us
10x=40*3
10x=120
x=12
Thus, the number of girls in Irene's class is 12.
