Solution
Solution
The Lying Jack-o’-Lantern
Jack-o’-lantern B is lying!

Under the same moonlight, the jack-o’-lanterns and their shadows form similar triangles, so their height-to-shadow ratios must match.
Jack-o’-lanterns A, C, and D all have shadows twice their heights. But B claims to be 13 inches tall with a 25-inch shadow. Its shadow should be 26 inches long.
One inch gave the liar away.
