Out of the 150 students in the sixth grade, you know that 20% received an A on the math test.
To know how many students received an A you have to calculate the 20% from 150.
To do so multiply it by 20 and divide it by 100:
[tex]\begin{gathered} x=\frac{150\cdot20}{100} \\ x=30 \end{gathered}[/tex]30 students received an A in the math test.
