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Riddle:

Out of 100 ladies attending the dance,

85 had a white hand bag;
75 had black shoes;
60 carried an umbrella;
90 wore a ring;

How many ladies must have had all four items?

 

Answer:

10

Divide by 3. All the ladies had three items. The remainder shows the number of ladies who had 4.

85
75
60
90
______
310 / 3 = 100 + 10 remainder

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Riddle:

A frog fell into a well 12 feet deep. He could jump 3 feet, but every time he jumped 3 feet, he fell back 2 feet. How many times did he have to jump to get out of the well?

Answer:

The tenth jump took him out. (On the tenth jump he reached 13 feet and was out.)

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Riddle:

A box of hardware contains nuts and bolts.  The bolts account for 25 percent of the number of items in the box.  What percentage are the bolts of the entire box.

Answer:

20 percent. For example, there are 10 bolts.  Since the number of bolts is 25 percent of the number of items, there must be 40 nuts. The total number of items = 10 bolts + 40 nuts = 50.  So, 10/50 = 1/5 = 20%.

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Riddle:

What single-digit number should go in the box with the question?

6 5 9 2 7
1 4 3 5 ?
8 0 2 8 1
Answer:

The missing number is 4.  Simply add the first and second rows together to get the third row value.

  65, 927
+ 14, 354
  80, 281
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Riddle:

If 10 bags of jelly beans and 6 licorice sticks cost $1, and 10 licorice sticks and 6 jelly bean bags cost 92 cents.

How much does one licorice stick cost?

 

Answer:

5 cents. Jelly bean bags cost 7 cents.

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Riddle:

Farmer Brown came to town with some watermelons. He sold half of them plus half a melon, and found that he had one whole melon left. How many melons did he take to town?

Answer:

Easy, three melons!

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Riddle:

What is the 4 digit number in which the first digit is one-fifth of the last, and the second and third digits are the last digit multiplied by 3?

Answer:

1155.

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Riddle:

In olden days, the student of logic was given this problem: If half of 5 were 3, what would one-third of 10 be?

Answer:

It would be 4.

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Riddle:

Walking home one day, you take a short cut along the train tracks. The tracks cross a narrow bridge over a deep gorge. At the point you are 3/8 of the way across the bridge, you hear the train whistle somewhere behind you. You charge across the bridge, and jump off the track as the train is about to run you down. As it happens, if you had gone the other way, you would have reached safety just before being run over as well. If you can run ten miles per hour, how fast is the train moving?

Answer:

The train is moving at 40 miles per hour. Imagine that a friend is walking with you. When the train whistle blows, you head away from the train, he heads toward it. When he reaches safety, you will be 6/8 (or 3/4)of the way across the bridge, and the train will have just reached the bridge. For the train to cross 4/4 of the bridge in the time you cross the remaining 1/4, the train must be moving four times your speed.

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Riddle:

Twelve flags stand equidistant along the track at the stadium. The runners start at the first flag. A runner reaches the eighth flag 8 seconds after he starts. If he runs at an even speed, how many seconds does he need altogether to reach the twelfth flag?

 

Answer:

Not 12 seconds. There are 7 segments from the first flag tot the eighth, and 11 from the first to the twelfth. He runs each segment in 8/7 seconds; therefore, 11 segments take 88/7= 12 4/7 seconds.

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