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IF 11×11 = 171

(13 votes, average: 4.23 out of 5)

July 26, 2016 by Srujin Kumar Kuramdas 3 Comments

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

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

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Comments

  1. Pankaj upadhyay says

    July 28, 2016 at 3:56 pm

    Ya d answer is 339.
    Congrats raju u r d 1st…..!👍

    Reply
  2. George Georgiev says

    July 28, 2016 at 12:03 am

    Hi guys, the answer is not 339 🙂 It’s playing with the number bases.
    Convert all answers from 8th base to 10th base and you get the right multiplication result that will be when you normally multiply the numbers.
    Thus:
    15*15 = 225 in 10th base, 341 in 8th base.
    The answer is 341

    Reply
  3. Rajaram Chandra Sah (Raju) says

    July 27, 2016 at 12:28 am

    he answer is 339. they are alternately adding 26 and 6 after initializing with 50.
    Just look at this.
    11*11=> 121+50=171
    12*12=> 144+50+26=220
    13*13=> 169+50+26+6=251
    14*14=> 196+50+26+6+26=304
    So now will add another 6 thus,
    15*15=> 225+50+26+6+26+6=339
    THAT’s IT….. Enjoyyy (Y)

    Reply

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