Catherine is taking you underwater to look at coral:

Caroline and her sister, Theresa, went snorkeling.

They swam to a coral reef. The reef was 11 feet by 12 feet in area.

Caroline and Theresa recorded all the coral they saw in their waterproof notebooks.

Caroline's notebook entries looked like this:

I saw 13 square feet of brain coral, 17 square feet of sea fan , and 21 square feet of colt coral.

Theresa's notebook looked like this:

I saw 32 square feet of staghorn coral, 16 square feet of purple mushroom coral, and 2 square feet of pink leather coral.

Here's the challenge:

How many square feet of coral did Caroline see?

How many square feet of coral did Theresa see?

How many square feet of the coral reef are NOT recorded in Caroline or Theresa's notebooks?

All underwater photos are copyright © 1998, 1999, 2001, 2002 by Curt Harpold, used here with permission from the photographer.