A 20 person classroom is filled with 40% girls. If 5 new boys join the classroom, what is the new percentage of girls in the class?
Let's think step by step below.
32
The number of girls in the classroom is 20 * 40% = 8 girls.

Before new boys join, the number of boys in the classroom is 20 - 8 = 12 boys.

If 5 new boys join, the new number of boys is 12 + 5 = 17 boys and the new total is 20 + 5 = 25 total people.

The new percentage of girls in the class is 8 girls / 25 total people = 32%.

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The answer: 32