What fraction of all students received 90% or higher?

Question

9/10 of the class received 70% or higher. of the students receving 70% or higher, 1/4 received 90% or higher. What fraction of all students received 90% or higher?

Answer 1

What fraction of all students received 90% or higher?

9/10 of the class received 70% or higher. of the students receving 70% or higher, 1/4 received 90% or higher. What fraction of all students received 90% or higher?

90% received a 70% or higher, and 25% of those received a 90% or higher

0.9 * 0.25 = 0.225

22.5% of the class received 90% or higher