suspension-bridge

The flashlight puzzle

Stanford, Peter, Edward, and Arnold need to cross a bridge at night. At most two people can be on the bridge at once. Among the men is one flashlight which must be carried during any crossing. The flashlight may handed between men but may not be thrown.

cows

The grazing cows

5 cows can eat 2 acres of grass in 10 days. 7 cows can eat 3 acres of grass in 30 days. The grass grows at a constant rate and each cow eats at a constant rate. The length of the grass before the cows begin grazing is constant.

painting

Expressionist painting

Just how good is your knowledge of art? Think you know your Picasso from your Praxiteles? Which famous piece of art is this from?