Question

The Himalayan Mountains have been growing slowly for about 50 million years. Using the same method, find out how many human lifetimes have passed since the Himalayan Mountains began to grow.

Complete the sentence to explain what you are trying to find out.

"I need to find out how many times *blank* divides into [50.000.000]."

A 50.000.000
B 80
C 625,000
D 50.000.000
E 80

Answer 1

To find out how many human lifetimes have passed since the Himalayan Mountains began to grow, you would need to determine how many human lifetimes fit into the time span of 50 million years. Assuming an average human lifetime is about 80 years, you would use the following logic:

"I need to find out how many times **80** divides into [50,000,000]."

Thus, the correct answer is **B 80**.