"What's the weight of this one?" asked Mrs Pothersniff, pointing to a large crab there on the wet slab.

Fred considered the question a moment. He had to have his little joke, and Fred was no respecter of persons. "It weighs exactly three quarters of its weight, and three quarters of three quarters of a pound," he told the pompous customer. "I guess you'll want it dressed."

The lady wasn't amused! But what did the crab weigh?