Answer:
There are 50 girls in Jonathan's class.
Step-by-step explanation:
To get this answer, we have 30 boys. We then write 60/100 as a fraction because so far we have 60% out of 100%. If you look at it, 30x2 equals 60 so you have to find __x 2= 100. In this case, the __ would be 50. Hope this helps! :)