I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Find the number of squares in the below picture

What is the fastest way to double your money?

Forwards I am heavy, backward I am not. What am I?

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?

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?

Prove that the below maths equation is true.

8 + 8 = 91

Move three sticks of the spiral below to form a square.

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?