What does it mean?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Can you solve the equation by finding the value of
A) Horse
B) Cowboy boot
C) Horseshoe

In the Picture?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

While house hunting in London, I came across a very good leasehold property Discussing the lease the landlady told me:

'The property was originally on a 99 years lease and two-thirds of the time passed is equal to four-fifths of the time to come. Now work it out for yourself and see how many years are to go!

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A couple went on a climbing trip. But only the husband returned from the vacation and said that his wife slipped off while climbing and died. On investigating, the local sheriff arrested him saying, 'Your travel agent called. You murdered your wife.'

The man did not inform anyone about the trip. Then how was the agent so sure that it was a murder?

Our product and our sum always give the same answer. Who are we?