Posted on

Some fish, some dogs and some children are swimming in a bay. There are 40 legs in total, twice as many heads as tails and more dogs than fish.

Some fish, some dogs and some children are swimming in a bay. There are 40 legs in total, twice as many heads as tails and more dogs than fish.

How many fish are in the bay?

Lets look the soluiton step by step.

  • Fish hasn’t got any legs. Dogs have 4 legs and a child has 2 legs.
  • All of them have heads.
  • If we say there are x tails there are 2x heads.

 

Let’s say a for child, b for dogs c for fish.

  • 4b + 2a = 40 (i)
  • 2c = a + b       (ii)
  • c > b                (iii)

from (i) and (ii)  2b + 4c = 40 ..  in the question said that c > b   and 4b + 2a = 40 .. Now, let’s look the opitons because this riddle have 3 answers.

for b = 2,  c =9,  a = 16

for b = 4,  c = 8, a = 14

for b = 6,  c = 7,  a = 8

Posted on

I had $370.00. My Mom gave $150.00. My Dad gave $150.00.

Math Riddle: I had $370.00. My Mom gave $150.00. My Dad gave $150.00. My Aunt and Uncle gave me $100.00. I had another $30.00. How much did I have?

This is a so hard riddle. Don’t be quick.  The answer is not $800. Think about it more times and read again and again.

Can’t you find the correct answer? Lets tell the step by step.

  • I had $370.00.
  • My Mom gave $150.00.
  • My Dad gave $150.00.
  • My Aunt and Uncle gave me $100.00.
  • I had another $30.00.

If your read again you can see mom, dad, aunt and uncle “gave”… We can’t count this money for I have.

Only we can sum  I had $370.00 and I had another $30.00.

So correct answer is $400.

 

Posted on

A young man decides to buy a collector’s baseball card. He pays $60 for it.

Riddle: A young man decides to buy a collector’s baseball card. He pays $60 for it. After a month, the value of the card has increased to $70 and he decides to sell it. But already a few days later he regrets his decision to sell the collector’s item, and he buys it again. Unfortunately he has to pay $80 to get it back, so he loses $10. After a year of owning the baseball card, he finally decides to sell it for $100. What is his overall profit?

 

This riddle seems very easy at first, but you need to be careful solving it or you might think you have found the answer correct and disappoint when you realize you could not find it. The most important thing you need to be careful is that the riddle asks for the overall profit not net profit. When he buys the card for $60 and sells it for $70, his profit here is $10. Later, he again buys it for $80 and after a while he again sells it for $100, his profit from this sale is $20. Therefore, his overall profit is the addition of his first and last profits and the answer is $30.

The answer is:  $30.00. Overall profit, not net profit!

Posted on

I had 13 dollars riddle

Riddle: I had 13 dollars. My father gave me 10 dollars then my mother gave me 20 dollars. My grandfather and grandmother gave me 50 dollars. I had another 15 dollars. How much did I have?

This is not a easy riddle. There lots of people gave me dollars. I had some dollars and asked totaly dollars which I had. Let’s count step by step and give the right answer of i had 13 dollars riddle.

 

Firstly, we must attention the tense. In the riddle some dollars are int the past before I had. If you read the riddle again, it asked “How much did I have?” so, Imust count the before my family gave me some dollars.

I have 13 dollars and had another 15 dollars. From this information the answer of htis riddle is 13 + 15 = 28 dollars. It doesn’t matter father, mother, grandfather and grandmother how much money gave me. All of these dollars after I had.

Posted on

Parker has a part-time job picking apples.

Parker has a part-time job picking apples. Let the random variable A represent the number of baskets of apples picked each day. The distribution of A has mean 4.5 baskets and standard deviation 1.3 baskets. Parker is paid $65 per day plus $5 per basket. What are the mean μ and standard deviation σ of Parker’s daily pay?

 

A=μ=$87.50 and σ=$71.50

B=μ=$87.50 and σ=$6.50

C=μ=$22.50 and σ=$6.50

D=μ=$87.50 and σ=$1.30

E=μ=$22.50 and σ=$71.50

 

Number of baskets of apples picked each day by Parker = A

Mean of A = 4.5 baskets

Standard deviation = 1.3 baskets

Daily payment received by Parker = US$ 65 + US$ 5 per basket

 

 

Let’s find out the mean and standard deviation of Parker’s daily pay:

Daily payment received by Parker = US$ 65 + US$ 5 per basket

Daily payment mean received by Parker = 65 + 5 * 4.5

Daily payment mean received by Parker = 87.5

Standard deviation in US$ = 1.3 * 5

Standard deviation in US$ = 6.5

The correct answer is B. μ = US$87.50 and σ = US$6.50

Posted on

Three numbers totaling 14.

Question: Three numbers totaling 14. The value of the first is half the value of the second and the value of the third is twice the value of the second. So what is the first number?

 

Solution:

A+B+C=14
A=1/2×B
C=2B

A+2A+2(2A)=14
7A=14
A=2

B=2(2)
B=4

C=2B
C=2(4)
C=8

Posted on

3 guys pay 10 dollars riddle

Today, we are talking about 3 guys pay 10 dollars riddle answer. It is an interesting math riddle known as missing dollar riddle or question.

Riddle: Three people check into a hotel. The clerk tells them that the bill for their stay is $30, so each person pays the clerk $10. The clerk puts the money in the cash register.

 

Later that night, the clerk realizes that he made a mistake and should have only charged the three guests $25. He pulls $5 in one dollar bills out of the register and tells the bellhop to return the money to the guests.

On the way to the room, the bellhop realizes that he cannot split the money evenly between the three people. As the guests don’t know that they were charged the incorrect amount for their room, the bellhop decides to simply give them $1 each and pocket the extra $2 as a tip. Each guest gets $1 back, so they each paid $9 for their room, totaling $27. The bellhop kept $2, and $27 + $2 = $29.

But the guests originally handed over $30. What happened to the missing dollar?

 

Solution:

Actually there is no missing dollar. It guides you while writing the question 🙂

The correct way to add up the total is to look at where all the money actually is. There is $25 in the cash register, $2 in the bellhop’s pocket, and each of the three guests has $1.

$25 + $2 + $1 + $1 + $1 = $30.