It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

The more of this there is, the less you see. What is it?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

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

What has 88 keys?

Can you find the mistake in the below statement?

Can you find any error in the following sentence?

A taxi was standing outside a fort at night. A man came out of the fort, opened the gate and hit the taxi driver killing him instantly. He took all the money out of the meter and started running till he was caught by a local sheriff.

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

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