Question

An ounce is equal to about 28 g. If 1 g of soil contains 2.5 billion bacteria, how many bacteria are in 1 oz of soil?

Answer 1

About 700 billion bacteria

Explanation:

Given

`1oz \approx 28g`

`1g = 25\ billion\ bacteria`

Required

Number of bacteria in 1 oz

`1g = 25\ billion\ bacteria`

Multiply both sides by 28

`28 * 1g = 25\ billion\ bacteria * 28`

`28g = 700\ billion\ bacteria`

Recall that

`1oz \approx 28g`

This means:

`1oz \approx 700\ billion\ bacteria`