Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

What has one eye, but can’t see?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

What has one letter and starts with an E?

What four weights can be used to balance from 1 to 30 pounds?

I am an odd number. Take away a letter and I become even. What number am I?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

Find the hidden panda in the image below.