Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

When we see 2 but call 10?

John is a strange liar.

He lies on six days of the week, but on the seventh day, he always tells the truth.

He made the following statements on three successive days:

Day 1: "I lie on Monday and Tuesday."
Day 2: "Today, it"s Thursday, Saturday, or Sunday."
Day 3: "I lie on Wednesday and Friday."

On which day does John tell the truth?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

The more you take me, the more you leave me behind.
Who Am I?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes