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

What number when divided in half becomes zero?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Count the number of triangles in the below picture?

What is the difference between a jeweller and a jailer?

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

I look at you, you look at me I raise my right, you raise your left. What am I?

What Adam and Eve do not have but the rest of the people have?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?