A MAN WAKES UP FROM HIS NIGHT SLEEP EATS HIS CEREAL RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

The third equation has a term with a pair of whistles. The last line involves a single whistle.

Furthermore, the man in the second and third lines are wearing a whistle, but the man in the last line is not wearing a whistle. Presumably the value of the whistle should be accounted for to get the correct answer.

The pictures can be translated into the following equations:

shoes + shoes + shoes = 30
shoes + (man + whistle) + (man + whistle) = 20
(man + whistle) + 2(whistles) + 2(whistles) = 13
shoes + (man) x (whistle) = ?

From the first equation we can solve for the shoes value:

shoes + shoes + shoes = 30
3(shoes) = 30
shoes = 10

We can then solve the second equation for the (man + whistle) value:

shoes + (man + whistle) + (man + whistle) = 20
10 + 2(man + whistle) = 20
2(man + whistle) = 10
man + whistle = 5

Then we solve the third equation for the whistle:

(man + whistle) + 2(whistles) + 2(whistles) = 13
5 + 4(whistles) = 13
4(whistles) = 8
whistle = 2

We also need to solve for the value of the man:

man + whistle = 5
man + 2 = 5
man = 3

Now we can evaluate the final expression, remembering the order of operations that multiplication should be evaluated before addition:

shoes + (man) x (whistle) = ?

10 + 3 x 2
= 10 + 3 x 2
= 10 + 6
= 16 Did you answer this riddle correctly?
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She opened the fridge door first! Did you answer this riddle correctly?
YES  NO  

The thief is the Sri Lankan seaman. They are on a Japanese ship, so it will bear a Japanese flag. The Japanese flag will look the same upside down. Did you answer this riddle correctly?
YES  NO  

Because his night watchman was sleeping on the job. Did you answer this riddle correctly?
YES  NO  

He lived in a lighthouse as lighthouse keeper. He turned off all the lights by accident, so a ship with 7 passengers couldnt negotiate the rocky shores. One would think the light switches in a lighthouse would be more clearly marked. Did you answer this riddle correctly?
YES  NO  

The woman shoots a picture of him, drowns the picture to develop it, then she hangs the picture Did you answer this riddle correctly?
YES  NO  

The wife is responsible. The reason is simple – she was supposed to be sleeping but she knew all that had happened! Did you answer this riddle correctly?
YES  NO  

Let us denote the four people with A, B, C and D.
A takes 1 minute to cross, B takes 2, C takes 5 and D takes 10.

A and B cross first spending 2 minutes.
A comes back with torch taking 1 minute.
C and D cross taking 10 minutes.
B comes back with torch taking 2 minutes.
Finally, A and B cross the bridge taking 2 minutes.

2 + 1 + 10 + 2 + 2 = 17 minutes

Thus, this is the way they all managed to cross that bridge that night. Did you answer this riddle correctly?
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He can sleeps at night... Did you answer this riddle correctly?
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Letter "E" is the most commonly used letter in English language, yet in the whole passage, there is no "E" used. Did you answer this riddle correctly?
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How he can walk up stairs in a one story house is that he lived in a lighthouse and when he turned the only light off in the lighthouse all the boats crashed on the shore and he saw a boat coming toward him Did you answer this riddle correctly?
YES  NO  

The king of hearts in a deck of cards. Did you answer this riddle correctly?
YES  NO  

The thief is the Sri Lankan seaman. They are on a Japanese ship, so it will bear a Japanese flag. The Japanese flag will look the same upside down. Did you answer this riddle correctly?
YES  NO  

There is no mail on Sundays. Did you answer this riddle correctly?
YES  NO  

The Police didn't tell the man where the crime scene was, but the man knew. Did you answer this riddle correctly?
YES  NO