What has a ring but no finger?

I cannot talk, but I always reply when spoken to. What am I?

I am quite hot but become too cold if you remove the first two letters. What am I?

A California farmer owns a beautiful pear tree. He supplies the fruit to a nearby grocery store. The store owner calls the farmer to see how much fruit is available for him to buy. The farmer knows the main trunk has 24 branches. Each branch has exactly 12 boughs and each bough has exactly 6 twigs. Since each twig bears one piece of fruit, how many plums will the farmer be able to deliver?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

What has no start, end, or centre?

Forwards I am heavy, backward I am not. What am I?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

Which letter of the alphabet has the most water?