# Mind Challenging Maths Riddles Questions and Answers Best-Riddles.com

These are the mind-challenging logical puzzle questions which will no longer most effective test your Mathematical skills but also logical reasoning. In those photo puzzles, you are supplied with some equations which can be Mathematical incorrect however these equations incorporate some logical sample which makes those equations logical accurate. Your project is to locate this logical pattern and then resolve the closing equation.

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# Maths Logical Questions and Answers

1. Which number replaces the question marks?

 72 Moving m a clockwise spiral, numbors aro doublo tho square of the first 9 numbers.

2. What is the next number in the sequence below?

The answer is 49. The difference between each two consecutive numbers grows in the order of 3, 5, 7, 9, 11, and 13 . All odd numbers.

3. Place the numbers 1 – 12 in the twelve circles below so the sum of each side of the triangle is 36. I will give you a head start by placing some of the numbers for you. (The numbers may be used once only).

4 .

4. What is the missing number in the pie below?

The missing number is 6.The two numbers opposite each other always total
21 : 15 + 6 = 21.

5. Can you determine the missing number in the box? The same rule of logic applies to all three boxes?

 The missing number is 24. The rule is to double the first number in each rectangle and place that number in the next box below it.

6. Below is a pyramid of numbers where the number on each brick is the sum of two bricks below it. The numbers given will help you fill in the entire pyramid.

43.

7. The numbers 1 – 9 can be placed in the nine circles below in such a way that both sets of crossed circles can add up to 26. From the numbers already given, where would the number 1 go? It can be placed in either one of two circles.

7.

8. In a group of 28 junior high school students, 7 take French, 10 take Spanish, and 4 take both languages. The students taking both French and Spanish are not counted with the 7 taking French or the 10 taking Spanish. How many students are not taking either French or Spanish?.

Seven students are not taking a language. Add 7 + 10 +4 to get 21.
Then subtract 21 from the total students: 28 – 21 = 7.

9. What number should replace the question mark?

86

10. What number should replace the question mark to a definite rule?

201 (add digits to previous number).

11. Which are the weak links?

 B .

12. How many squares are there in this figure?

14 Squares.

13. Now can you tell how many triangles are there in this figure?

There are 47 triangles.

14. Which number continues this sequence?

48
Numbers advance by 2, 4, 8 and 16.

15. Which number does not fit in this sequence?

8
The sequence follows the for¬mula double Ihe previous number then add 1. etc.

16. Which number is missing?

64
Each box represents Ihe cube of numbers 1, 2,3 and 4.

17. Which number is missing from the box?

 9 Each row; column and diagonal adds up to 15.

18. Which number completes this sequence?

81
As you go down, subtract the sum of tne separate digits in each number from itself to give the next number.

19. Which number is missing from this wheel?

152
As you move clockwise multiple the previous number by 2 and ado 2, 3, 4, 5 and 6

20. What is X?

6
The series is spaced incorrectly. When the spacing is correct it becomes: 2 4 8 16 32 64 128, 256, which is an obvious doubling-up series..

21. What comes next?

5
The numbers are the alphabetical positions of the letters, spelling FACADE :
6-F; 1-A; 3-C; 1-A; 4-D; 5-E.

22. What number goes into the empty brackets?

5 6 2 5
The first number inside the brackets is the square root of the number outside the brackets. The remaining number inside the brackets is the square of the number outside the brackets.

23. What comes next in this series?

5040
Multiply each number by 2, 3, 4, 5 and 6 and (finally) 7.

24. What comes next in the series?

16
Each number reverses the previous number and adds 1 to each digit. Thus, in the first two terms, 16 reversed is 61, which then changes to 72. In the penultimate term, 50 reversed becomes 05, which in turn becomes 16 – by adding 1 to each digit.

25. 5 Friends live in the same road A, B, C, D, E. The numbers of B, C, D when multiplied together equals 1260. The numbers B, C, D when added equal twice E’s number, and is even.A’s number is half as much again as E’s. The road numbers run from 2 to 222.What are the 5 house numbers?

A 36
B 4
C 9
D 35
E 24.

26. Which number goes in the center of the third triangle?

36
The answer in the centre of each triangle equals the difference between the top and left hand values, multiplied by the right hand value.

27. If I had one more sister I would have twice as many sisters as brothers. If I had one more brother I would have the same number of each. How many brothers and sisters have I?

Three sisters and two brothers.
This can be solved by simple deduction, but if algebra is used let x be the number of sisters and y the number of brothers :
x+ 1= 2y
y+ 1= x
Therefore, y + 1+ 1= 2y
so y =2 or x + 1= 2x – 2
so x = 3.

28. A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

59
The first 56 balls could be of all colours except red. This would leave 8 balls, all of which are red. so any three chosen would be red.

29. A driving school claims an average test pass rate of 76.8 percent. What is the least number of pupils required to achieve this result?

125
96 passes out of 125 give an average of 76.8% .

30. Which number goes in the middle?

17
Moving diagonally downwards from loft lo right, numbers increase by the same amount each line.

31. 10, 50, 13, 45, 18, 38, ?, ? What two numbers should replace the question marks?

25, 29.
There are two alternate sequences: start at 10 and add 3, 5, 7;
start at 50 and deduct 5, 7, 9

32. Which number is the odd one out? 9654 4832 5945 7642 7963 8216 3649

3649
In all the others multiply the first two digits together to produce the number formed by the last two digits.

33. 1, 3, 4, 7, 11, 18, 29, ? What number should replace the question mark?

47
Each number is the sum of the previous two numbers, ie 18 + 29 = 47.

34. 70 91 120 14 13 24 5    7    ? What number should replace the question mark?

5
70 ÷ 14 = 5;
91 ÷ 13 = 7,
120 ÷ 24 = 5;

35. What number should replace the question mark? 123, 124, 126, 132, 133, 136, 142, 143, 147, ?

154
Add the first digit to arrive at the second number i.e. 123 + 1 = 124, then the second digit i.e. 124 + 2 = 126, then the third digit etc.

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