1. How can you make seven even?

Remove the ‘s’.

2. What is the longest word in English?

SMILES, as the two S’s are a MILE apart.

3. Fill in the next three letters in the pattern O, T, T, F, F, S, S,…..

E, N, T. (It is as simple as One, Two, Three,…)

4. What weighs more : a pound of feathers or a pound of iron?

They weigh the same.

5. In a row of five persons, A is next to B. E is on right side of A who has D on his left side. C and D do not sit together. Who are sitting at the two ends of the row?

C and D.

6. A shopkeeper has four weights (in kg) which enable him to weigh any commodity in whole number of kilograms up to 40 kg. He uses these weights on both pans of the balance, if necessary. Find the four weights he uses.

1, 3, 9, 27 kg. Do you see the pattern?

7. A person has nine coins, all looking alike but one of them slightly lighter than the others. Using a balance without weights, can he discover the lighter coin in just two weighings? If the number of coins is 12, how many minimum weighings will be required to find the lighter coin?

Weigh coins 1, 2, 3 against 4, 5, 6. If they balance, take next 3 coins, otherwise take the lighter lot. Now, among those three, weigh one against second. If they balance, remaining coin is lighter, otherwise the lighter coin is obviously the coin we are looking for. If there are 12 coins, then minimum 3 weighings are necessary to find the lighter coin.

8. You have 10 stacks of coins with 10 coins in each stack. One stack of coins are all counterfeit and weigh one gram more than genuine ones. A genuine coin weighs 13 grams. Using a pointer scale (which shows the actual weight), what is the smallest number of weighings necessary to determine which stack is counterfeit?

Only one! Number the stacks 1-10. Take 1 coin from 1st, 2 coins from 2nd, and so on. You are weighing 55 coins which should give a total weight of 55 x 13 = 715 grams. The number of grams over this amount indicates the stack of counterfeit coins.

9. A ship is at an anchor. Over its side hangs a rope ladder with rungs a foot apart. Eight feet of this ladder is above water when the tide begins to rise at the rate of 8 inches per hour. How much of the rope ladder will remain above water at the end of six hours?

As the ship is afloat, the water level in relation to ship remains the same. Thus, at the end of six hours, rope ladder will still be 8 feet above water.

10. Three boxes are labeled ‘Apples’, ‘Oranges’ and ‘Apples and Oranges’. Each label is incorrect. You may select only one fruit from one box. (No feeling around or peeking permitted). How can you label each box correctly?

Pick up one fruit from box labelled ‘Apples and orange’ and…..

11. A peasant has to cross a river with his goat, dog and a bundle of grass. The boat can carry the peasant with only one more item in a trip. The goat if left with the grass will eat it. If the dog and the goat are left behind, the dog will bite the goat. What is the minimum number of crossings required to transfer all four to the other side?

Seven. Peasant goes with goat, leaves it there, comes back. Then he goes with dog, leaves it, comes with goat. Then he goes with grass, leaves it, comes back. Finally he goes with goat.

12. A three centimeter cube has been painted red on all its sides. It is cut into one centimeter cubes. How many small cubes will be there in all? How many of these will be there with only
-one side painted red
-two sides painted red
-three sides painted red
-no side painted red?