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If 10x11x12 = 9 Number puzzle

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Number Puzzle #162
if-10x11x129
10×11×12=9
11×12×13=9
12×13×14=9
13×14×15=9
14×16×20=?

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To 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

If 2-1=3 what is 10-10=???

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Number Puzzle #161
if-2-1-3
If
2-1=3
4-4=0
8-5=40
10-10=???
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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 in the middle box ?

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Number Puzzle #159

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

10          3                      4               5                       7              2

‘      29                                    4                                       ?

8            4                      6               1                        3             5

IF 3-2 = 2, 16-10 = 4

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Number Puzzle #157

1000 - 265 = ?

If 3 – 2 = 2
16 – 10 = 4
117 – 99 = 9
Then 1000 – 265 = ?

This puzzle is courtesy Pranav, shared via Whatsapp

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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

If 1 + 4 = 5, then 8 + 11 = ?

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Number Puzzle #156
1+4=5 number puzzle #156

If 1 + 4 = 5
2 + 5 = 12
3 + 6 = 21
Then 8 + 11 = ?

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its
(first number * second number) + first number
so
8 + 11 = 8*11 + 8 = 88 + 8 = 96

IF 11×11 = 171

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Number Puzzle #155

Number Puzzle #155, If 11x11=171
11×11=171
12×12=220
13×13=251
14×14=304
15×15=?

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11×11 = 121 = 171 in base 8
read here on how to convert one number from 10 base to another base
by following that:
121/8 = 15 R 1
15/8 = 1 R 7

= 1*8^2 + 7*8^1 + 1*8^0 = 171

thus 15×15 = 225
225/8 = 28 R 1
28/8 = 3 R 4
= 3*8^2 + 4*8^1 + 1*8^0 = 341

OR you can try this online tool to convert the base

Answer courtsey: George Georgiev