Puzzle for April 09, 2010

Sunday is the 144rd anniversary of the founding of The American Society for the Prevention of Cruelty to Animals (ASPCA) in New York City. So let's talk about pets today.

A cat weighs about 1/5 of the weight of a "medium sized" dog. A "big" dog weighs 3 times the size of a medium dog.

If together they weigh 20 pounds less than me, what do they all weigh? I weigh a fifth of what a small horse weighs at 940 pounds.