IN A STREET THERE ARE FIVE HOUSES PAINTED FIVE DIFFERENT COLOURS IN EACH HOUSE LIVES A PERSON OF DIFFERENT NATIONALITY THESE FIVE HOME OWNERS EACH DRINK A DIFFERENT KIND OF BEVERAGE SMOKE DIFFERENT BRAND OF CIGAR AND KEEP A DIFFERENT PET THE BRITISH MAN LIVES IN A RED HOUSE THE SWEDISH MAN KEEPS DOGS AS PETS THE DANISH MAN DRINKS TEA THE GREEN HOUSE IS NEXT TO AND ON THE LEFT OF THE WHITE HOUSE THE OWNER OF THE GREEN HOUSE DRINKS COFFEE THE PERSON WHO SMOKES PALL MALL REARS BIRDS THE OWNER OF THE YELLOW HOUSE SMOKES DUNHILL THE MAN LIVING IN RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

Gravi-tea. Did you answer this riddle correctly?
YES  NO  

Penal-Tea Did you answer this riddle correctly?
YES  NO  

Penal-tea. Did you answer this riddle correctly?
YES  NO  

The Lizard of Oz! Did you answer this riddle correctly?
YES  NO  

A candle Did you answer this riddle correctly?
YES  NO  

Toilet Did you answer this riddle correctly?
YES  NO  

Oven Did you answer this riddle correctly?
YES  NO  

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?
YES  NO  

There are 10 legs under the table in total. We have a grandmother (a mother), her daughter (both a mother and a daughter) and her granddaughter (a daughter and granddaughter) hence how we have the number of mothers and daughters sat around the table. Did you answer this riddle correctly?
YES  NO  

I'm a Door-Mat Did you answer this riddle correctly?
YES  NO  

On the world wide web. Did you answer this riddle correctly?
YES  NO  

Earth Did you answer this riddle correctly?
YES  NO  

Toilet Did you answer this riddle correctly?
YES  NO  

A broom Did you answer this riddle correctly?
YES  NO  

Refrigerator Did you answer this riddle correctly?
YES  NO