10 Tricky Detective riddles to test your IQ

Jenny

Explanation : Suppose if Adriana is his sister and we know that his statement is false.

This will mean that Mary is not his girlfriend.

If Angel is telling the truth, then Adriana must be lying that we have already assumed.

If Jenny is his girlfriend, then she must have spoken a lie as well.

This will mean Angel is speaking the truth which is true in what we have assumed.

At last, Mary said that Jenny is not his sister which is also true as we have made the assumption already that Jenny is his girlfriend.

In what we have assumed, all the statements fit perfectly and the given conditions are satisfied. If you make any other assumption, you will find that one or more conditions are not fulfilled.

Adriana is the sister and Jenny is the girlfriend.

If the officials thought he was jumping with a hostage, they would never risk giving him a faulty parachute.

Gogo thought to himself," I can calculate out how many days there will be for the 13th on each month if i count from the beginning of the year (January 1). Then i can divide total days by 7 to get the remainders. I will also need to consider the leap year. Through the whole year i  had all kinds of remainders, from 0 to 6. The minimum of occurrence for all the unique remainders was 1. It means that there is at least one Friday on 13th. In a regular year, the best chance you  can get 3 Fridays on 13th, which are in February, March and December because the remainders of these 3 months are 2. In a leap year, the best chance you also can get 3 Fridays on 13th, which are in January, April and July because the remainders of these 3 months are 6.

Mark Crimson "?" = question MARK, so the note on the door reads "Question Mark Crimson broke your window." 

(Hint :The main hint here is that the lock can be closed without a key, so think about it and Kushal will get the answer.)

The lock can be closed without a key.

When Kushal were keeping the things inside the shed, the murderer took the lock hanging on the door and replaced it with an identical one.

Kushal closed it as it did not require a key. When  Kushal were gone, the murderer opened the new lock with his key, planted the body inside, replaced the lock with the original one again and locked it.

Gogo is a of short stature. He can't reach the upper elevator buttons, but can push is with his umbrella.

Let x be the answer Aalia wants, the number of drops required.

So if the first egg breaks maximum she can have x-1 drops and so she  must always put the first egg from height x. So she has determined that for a given x she must drop the first ball from x height. And now if the first drop of the first egg doesn't breaks she  can have x-2 drops for the second egg if the first egg breaks in the second drop.

Taking an example, if 16 is her answer. She needs 16 drops to find out the answer First She drops from height 16,and if it breaks she  tries  all floors from 1 to 15. If the egg doesn't  break then she has left 15 drops, so she will drop it from 16+15+1 =32nd floor. The reason being if it breaks at 32nd floor she can try all the floors from 17 to 31 in 14 drops (total of 16 drops). Now if it did not break then she is  left with  13 drops. and she can figure out whether she can find out whether she can figure out the floor in 16 drops.

Lets take the case with 16 as the answer

1 + 15 16 if breaks at 16 checks from 1 to 15 in 15 drops
1 + 14 31 if breaks at 31 checks from 17 to 30 in 14 drops
1 + 13 45 .....
1 + 12 58
1 + 11 70
1 + 10 81
1 + 9 91
1 + 8 100 We can easily do in the end as we have enough drops to accomplish the task

Now finding out the optimal one she can see that she could have done it in either 15 or 14 drops only but how can she find the optimal one.  The optimal one will be needing 0 linear trials in the last step.

So she could write it as

(1+p) + (1+(p-1))+ (1+(p-2)) + .........+ (1+0) >= 100.

Let 1+p=q which is the answer she is looking for

q (q+1)/2 >=100

Solving for 100 she gets q=14.
So the answer is: 14
Drop first orb from floors 14, 27, 39, 50, 60, 69, 77, 84, 90, 95, 99, 100... (i.e. move up 14 then 13, then 12 floors, etc) until it breaks (or doesn't at 100)

Yes, it was. Kushal ran out into the street while chasing a stranger. But eyeglass lenses don`t fog up when a person comes out of a warm room and into the cold. He was just afraid to confess to his wife that he had broken her favourite statuette.

Detective Mehul suspects the newspaper delivery person. The absence of Tuesday's and Wednesday's newspapers indicates that the delivery person knew there was no one there to read them.

Glance at the first and second statement again; they are contradictory. Both can be true together though. Also both of them cannot be false which means that Gogo stole cat and his statement will be true. But it has been already deduced that the one who stole cat was telling a lie thus it can?t be possible.

Let us consider the situation again. It may be that Gogo stole a hen or a dog. Assume that he stole hen. In such a case the statement of Gogo will be false. But we know that the person who stole hen told the truth, thus it is contradicting our assumption and so cannot be correct.
Considering everything, now we can say with confidence that Gogo stole the dog.

Now it means that the statement by Jagga is completely false and the statement by Dhamaka Singh is true which depicts that the cat and hen are stolen by these two. Also we know that the one who stole hen is true and the one stealing cat is a liar. Thus we now know that Jagga stole cat and Dhamaka Singh stole hen.

Hence we can deduct the following as our answer;

Jagga Stole Cat

Dhamaka Singh stole Hen

Gogo Stole Dog