Question

A penny is about 5×10−3 feet thick. The One World Trade Center building is about 2,000 feet tall. How many pennies would be in a stack of pennies as tall as the One World Trade Center building?

Answer 1

400000 pennies

Explanation:

A penny is about 5×10^-3 feet thick. The One World Trade Center building is about 2,000 feet tall.

The number of pennies that would be in a stack of pennies as tall as the One World Trade Center building is calculated as:

Height of the building ÷ Thickness of a penny

Height of the building = 2000 feet

Thickness of a penny = 5 × 10^-3 feet

Hence:

= 2000feet/ 5 × 10^-3 feet

= 400000 pennies