What is common among 11, 69, and 88?

Can you place six X (crosses) in below board without making three in a row in any way ?

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

What does below Rebus mean ?

esgg sgeg gegs gsge

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?