9th grade math

Suppose there were a steel band

fitting tightly around

the equator of the earth.

Now suppose that you remove it

and cut it at one place, then splice in an additional piece

10 feet long,

so that the new band is

10 feet longer than the original one.

If you now replace it on the equator, . . .

[how] large a space would there now be

between the band and the earth?

The Education of T.C.Mits, pp. 32-33

Reminders:

The circumference of earth at the equator is 25,000 miles.

The formula for circumference is: C = 2 * π * radius.

Footnote: I'm astonished to find that T.C.Mits is still in print. It's even older than I am!