# 100+ Challenging math riddles to keep your mind sharp #### Bees and Flowers Logic -Math riddle

###### 31.Math Riddles
```There are some lotus flowers in a pond and some bees are hovering around.
If one bee lands on each flower one bee will be left,
If two bees land on each flower one flower will be left,
Then the number of flowers and bees respectively are

How many flowers and bees are there?```
• A.3,4
• B.4,3
• C.2,3
• D.3,2
A.3,4
```Explanation :

Let the number of flowers  = x
if one bee lands on each flower Then one bee will be left So number of bees in this case =x*1+1=x+1
If two bees land on each flower then one flower will be left  so number of bees in this case
=(x-1)*2=2x-2
we have
x+1=2x-2
x=3
Number of flowers  =3
Number of bees =x+1=3+1=4```

#### Magnifying Glass -Math riddle

###### 32.Math Riddles
`Jim was examining an angle measuring 14 and 1/2 degrees, using his magnifying glass that magnifies everything two times. Under the glass, how large would that angle measure?`

```Explanation :

14 and 1/2 degrees, because magnifying glass that magnifies everything two times```

#### Laying Egg's -Math riddle

###### 33.Math Riddles
`If a hen and a half lay an egg and a half in a day and a half, how many eggs will half a dozen hens lay in half a dozen days?`
`Two dozen (24) `
```Explanation :

If you increase both the number of hens and the amount of time available four-fold (i.e., 1.5 times 4 equals 6),
the number of eggs increases 16 times.
16 * 1.5 = 24.```

#### How many kids-Math riddle

###### 36.Math Riddles
```At a children's party,
and 6 kids had juice and cake.
How many kids were there at the party?```
`12 kids`
```Explanation :

6 kids had juice and cake, leaving 2 out of the cake eaters that didn't have juice.
As there were 10 juicers, there must be 12 kids in total.```

#### How many earrings are being worn in this club? - Math Riddle

###### 37.Math Riddles
`There is a certain club which is for men only. There are 600 men who belong to this club and 5% of these men wear one earring. Of the other 95% membership, half wear two earrings and the other half wear none. How many earrings are being worn in this club?`
`600 `
```Explanation :

We know that 5%, or 30 of the men are wearing one earring. Of the other 95%, or 570, we know that half are wearing two earrings and the other half none. This is the same as if they all wore one.

first off, 5% of 600 is 5 * 600 / 100 = 30.
So 95% is 570. so there are 570 + 30 = 600 earrings.```

#### Bill was eight times the age of his son - Math Riddle

###### 38.Math Riddles
`Eight years ago, Bill was eight times the age of his son Bill Jr. Today, if you add their ages together, they add up to 52. How old are Bill and his son?`
`Bill is 40, and Bill Jr. is 12.`
```Explanation :

Eight years ago, Bill Jr. was x years therefore Bill was 8x

Today

(x+8) +(8x+8) = 52

x+8 + 8x+8 = 52

9x + 16 = 52

9x = 52–16

9x = 36

Therefore x = 4

Bill Jr. is

x + 8 = 12

4 + 8 = 12 years old

Bill is

8x + 8 = 32 + 8

32 + 8 = 40 years old

Therefore 12 + 40 = 52 years.```

#### Three matches are sitting on a table -Math riddle

###### 39.Math Riddles
`Three matches are sitting on a table. Without adding another make for three matches four. You are not allowed to break any of the matches. How can this be done?`

```Explanation :

Shape the 3 matches into a roman numeral four.```

#### Nonstop Train -Math riddle

###### 40.Math Riddles
`A nonstop train leaves Moscow for Leningrad at 60 mph. Another nonstop train leaves Leningrad for Moscow at 40 mph. How far apart are the trains 1 hour before they pass each other?`

```Explanation :

100
Two trains speed is 60 and 40 mph. so 1 hour before they will be in a position to cover their speed.
so 60+40 = 100 miles away from each other.```

#### Three times as old as my sister was -Math riddle

###### 41.Math Riddles
```One sister says of her younger sister:
"Two years ago, I was three times as old as my sister was. In three years's time, I will be twice as old as my sister.? How old are they each now?```

```Explanation :

One way to solve this math  is to use even numbers: The elder sister will be twice as old as her younger sister in three year's  time. This immediately rules out the elder sister currently being 8, 11, and 14, so she must be 17, and the younger sister 7.```

#### Creature and Fill tank -Math riddle

###### 42.Math Riddles
`There is a Creature which could double its size every day. So, if the Creature is put in a tank then it will fill the tank in 10 days. How many days would it take for the creature to fill 1/2 and 1/4 of the tank?`
`9 days to fill 1/2 and 8 days to fill 1/4 of the tank.  `
```Explanation :

If the creature fills the tank in 10 days and it doubles every day, on the ninth day it would fill 1/2 the tank. Thus on the 8th day it will fill 1/4 of tank.```

#### What is the next number -Math riddle

###### 43.Math Riddles
```What is the next number in the series?
7,645  5,764  4,576  ?```
`6,457`
```Explanation :

The last digit is moved to the front to make the next number.
In this number series,
7,645 = 5,7645
similary,
4,576 = 6,457```

#### How many brothers and sisters are there in the family? - Math Riddle

###### 44.Math Riddles
```A boy has as many sisters as brothers, but each sister has only half as many sisters as brothers.
How many brothers and sisters are there in the family?
A boy has as many sisters as brothers, but each sister has only half as many sisters as brothers.
How many brothers and sisters are there in the family?```

```Explanation :

Four brothers and three sisters.```