Add 20 dogs to 15 cats which is 35 animals. The way I figure this out is to see what percentage it could be in 100% then multiply that by 5. To get 500 to 100, divide by 5. Then divide 35 by 5 to match which is 7. 35 is 7% of 500, so 7% of animals were adopted on Saturday
The teacher wants answers from all the students but it would take to long to ask every single person so it would only make sense to ask every boy in each grade