Answer:
Explanation:
If 42 is 60%, let's find what 10% would be. 42 divided by 6 = 7. 10% would be 7 kids. now, we can do 7*4 because on the small bus is 40% of kids. 7*4=28 kids. 28 + 42 = 70 kids. you could have also done 7*10 for this answer because of the 7 = 10% and we want the 100%