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?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

What can you catch but never throw?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

What word is pronounced the same if you take away four of its five letters?

Find the next number in the series below

21 32 54 87 131 ?

How many words can a pen with half refill write?

John was drowned by he was not wet. How?

Why is a river so rich ?