Q:

A:

Huge shoutout and thanks to http://matchstickpuzzles.blogspot.com/

How much time will the workers spend? Think about the units 🙂

The first question is what are the signs: 2 pluses, 2 minuses or one of each which leaves just two answers.

The second question is how do we get 16x^2: is it (8x)(8x) or (4x)(4x)?

There are well over 200 boys altogether and only 56 chose Niagara Falls — way less than half so 2 of the answers can be eliminated.

How many boys chose Niagara Falls?

What was the total number of boys?

Use division:

56 out of the total number of boys