In my neighbourhood lives a man who weighs 200 pounds. He has two sons. They both weigh 100 pounds each. On a festival day they decide to go across the river on a boat to visit some relations. But the boat could carry a maximum load of only 200 pounds.

Yet they managed to get across the river by boat. How did they?

At a garden shop they’re selling Magic Grass, a patch of sod that doubles in size every day. A man goes to buy some and figures that his garden is big enough that if he buys one patch, it will cover his garden in 14 days, because each day it doubles in size. So he decides to speed up the process, and buys two patches of sods.

How many days will it now take for the Magic Grass to cover his garden?

The answer I give is yes, but what I mean is no. What was the question?

A wholesale merchant came to me one day and posed this problem. Every day in his business he has to weigh amounts from one pound to one hundred and twenty-one pounds, to the nearest pound. To do this, what is the minimum number of weights he needs and how heavy should each weight be?