# Number Puzzle #168

If 1 + 2 = 13

2 + 3 = 61

3 + 4 = 193

Then 4 +5 = ?

Check your answer:-

**Answer**: 481

**Explanation**:

A+B = (A*B + 2)^2 – 3

Answered by: in disqus comments.

If 1 + 2 = 13

2 + 3 = 61

3 + 4 = 193

Then 4 +5 = ?

Check your answer:-

Can you find the missing number in the below triangle from the 4 options given in the image ?

Check your answer:-

Answer With Explanation**Explanation**: Its actually simple logic, generally we think to find out the relation between the opposite sides, but here the relation is in between adjacent numbers, which is very unusual though.

9 * 2 = 18 -1 = 17

160 *2 = 320 -1 = 319

475 * 2 = 950 – 1 = **949**

**4, 72, 652, ?**

Check your answer:-

Click here to See SolutionHide
answered by readers in comments

it is 2^2 => 4

3^3 => 27 => reverse 72

4^4 => 256 => reverse 652

thus the next number should be

5^5 => 3125 => reverse 5213

**Number Puzzle #163**

What next

2 , 2.5 , 3.33 , 4.25 , _ , _ ?

Check your answer:-

First Number

Second Number

Click here to See SolutionHide
here the series is

2+1/2

2+1/2

3+1/3

4+1/4

thus next numbers should be

5+1/5 and 6+1/6

Number Puzzle #162

10×11×12=9

11×12×13=9

12×13×14=9

13×14×15=9

14×16×20=?

Check your answer:-

Click here to See SolutionTo solve this, replace a n digit number by adding all digits, and solve, keep on repeating it until you get single digit.

10×11×12={(1+0)×(1+1)×(1+2)}^2 =6^2=36=3+6=9

11×12×13={(1+1)×(1+2)×(1+3)}^2 =24^2 =(2+4)^2=36=3+6=9

12×13×14={(1+2)×(1+3)×(1+4)}^2 =60^2 =(6+0)^2 =36 =3+6=9

13×14×15={(1+3)×(1+4)×(1+5)}^2 =120^2 =(1+2+0)^2 =9

14×16×20={(1+4)×(1+6)(2+0)}^2 =70^2 =(7+0)^2 =49 =4+9=13=1+3=4

Number Puzzle #161

If

2-1=3

4-4=0

8-5=40

10-10=???

Check your answer:-

here a-b=axa+(a/2)x(a/2)-axb

2-1=2×2+(2/2)x(2/2)-2×1=3

8-5=8×8+(8/2)x(8/2)-8×5=40

4-4=4×4+(4/2)x(4/2)-4×4=4

thus

10-10=10×10+(10/2)x(10/2)-10×10=25

Number Puzzle #160

Check your answer:-

Click here to See SolutionHideDifference of the numbers are following a patter

5 -3 => 2 (1*1*1+1)

33 -5 => 28 (3*3*3+1)

next difference should be (5*5*5 +1) => 126, so 33 + 126 => 159

503 -159 => 344 (7*7*7+1)

1233 -503 => 730 (9*9*9+1)

soln by our readers in comments.

Solve this 5 boxes puzzle, what will be the value of the middle box in 3rd set ?

10 3 4 5 7 2

‘ 29 4 ?

8 4 6 1 3 5

Check your answer:-

Click here to See SolutionHide
the logic is

(first digit square + second digit square) – (third digit square + fourth digit square)

(10^2 + 3^2)-(8^2+4^2) = 29

(4^2 +5^2) – (6^2 +1^2) = 4

(7^2 + 2^2) – (3^2 +5^5) =19

(first digit square + second digit square) – (third digit square + fourth digit square)

(10^2 + 3^2)-(8^2+4^2) = 29

(4^2 +5^2) – (6^2 +1^2) = 4

(7^2 + 2^2) – (3^2 +5^5) =19

16 – 10 = 4

117 – 99 = 9

Then 1000 – 265 = ?

This puzzle is courtesy Pranav, shared via Whatsapp

Check your answer:-

Click here to See Solution
if you write the numbers in english words and than subtract the total number of alphabets in both the word, you will get the answer

for example

three – two = 2

sixteen – ten = 4

one hundred seventeen – ninety nine = 19 – 10 = 9

so

one thousand – two hundred sixty five = 11 – 19 = -8

Number Puzzle #156

If 1 + 4 = 5

2 + 5 = 12

3 + 6 = 21

Then 8 + 11 = ?

Check your answer:-

Click here to See Solution
its

(first number * second number) + first number

so

8 + 11 = 8*11 + 8 = 88 + 8 = 96

(first number * second number) + first number

so

8 + 11 = 8*11 + 8 = 88 + 8 = 96

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