Explain simply why 70 is the correct answer to: Bella, Monica, and Rachel are friends who like jewelry. Bella has 10 earrings, which is 25% of Monica's earrings, and Monica has twice as many earrings as Rachel. How many earrings do all of the friends have?. Explanation:
Bellas has 100% / 25% = 4 times less earrings than Monica. This means that Monica has 10 * 4 = 40 earrings. Rachel has two times fewer earrings than Monica, which means 40 / 2 = 20 earrings. So all three friends, have a total of 10 + 40 + 20 = 70 earrings.