At a school fair 70% of the people are under 16 years old one third of the people remaining are teachers if there are 21 teachers at the fair how many people are there at the fair total

Hello! One-third of the remaining people are teachers and there are 21 of them. Percents are parts of 100, and 100 - 70 is 30. 1/3 of of that 30% are teachers, and 10 is 1/3 of 30. 10% of those at the fair are teachers and there are 21 of them. As we see, 10% is 1/10 of 100. For this, all we need to do now is multiply 21 and 10. 21 * 10 is 210. There. A total of 210 people are at the fair.