Question

if 7 out of 8 people use crust toothpaste, how many use this product in a city with a population of 40,000?

Answer 1

Since 7 out of 8 people use crust toothpaste, in a city with the population of 40,000, 87.5% of the people use crust. so 40,000*87.5%= 35,000.