Question

How many hours (to the nearest hour) would it take you to count one billion if you counted one number

Answer 1

Answer:

You would need 5,555,556 hours to count 1 billion.

Step-by-step explanation:

Proportions

If you count one number every 20 seconds, then you can count 3 numbers in a minute.

Counting 3 numbers in a minute will allow counting 3*60 = 180 numbers in an hour.

At the same counting rate, if you wanted to count 1 billion numbers, we can calculate the hours needed by dividing:

1,000,000,000 / 180 = 5,555,555.55

Rounding to the nearest hour, you would need 5,555,556 hours to count 1 billion.