SE RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

I forgot my change! Did you answer this riddle correctly?
YES  NO  

The Maid; As she said she was dusting the corners and in a round house, there are no corners... Did you answer this riddle correctly?
YES  NO  

Her heart. Did you answer this riddle correctly?
YES  NO  

Look at debits and credits from his wallet:
buy Firework: -60
sell Firework: +70
buy Firework: -80
sell Firework: +90
+20

He profited $20 Did you answer this riddle correctly?
YES  NO  

My watch. Did you answer this riddle correctly?
YES  NO  

Because they only really have three main thoughts; 'Can I mate with it, will it hurt me or can I eat it?' Did you answer this riddle correctly?
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They were fed up with the hole business Did you answer this riddle correctly?
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A safety pin Did you answer this riddle correctly?
YES  NO  

A Muscle! Did you answer this riddle correctly?
YES  NO  

A Barometer Did you answer this riddle correctly?
YES  NO  

The loss is $100. Did you answer this riddle correctly?
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Stars 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  

The letter 'T'

(T)emporary and Permanen(t) Did you answer this riddle correctly?
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A Boomerang Did you answer this riddle correctly?
YES  NO