It is time to join the rest of the world, and use the metric system. The metric system was made to be the universal standard, so let's adopt it!
Here are some examples:
If you go to buy carpeting, and you need 100 square feet, the carpet costs $10 per square yard, could you, even given these simple numbers, ever figure out how much you'll pay? Which is more, 2 quarts, 5 pints or 36 fl oz? How many pints are in a gallon? How many pounds are 200 ounces? Which drill is the larger - the 13/64, the 1/4 or the 5/32? Two cities on a map are 10 inches apart - what is their real world distance?
Everything would be easier for everyone, if we just switched over. We are one of the LAST three countries to use the metric system... everyone else is happy with it, so shouldn't we?