My younger sister is twenty-two years old.

It takes twenty minutes to get to my house.

He had twenty old coins.

It takes twenty minutes to get to my house.

There are twelve students in my class.

This two-dimensional array represents students in each row and subjects in each column.

We need to think about this problem in multiple dimensions.

There are a hundred houses in this town.

A positive-definite matrix is an important concept in linear algebra.

There are times when we perform calculations with the haversine in trigonometry.