Stranger Math

Algebra Level 3

In the year 4231, an astronaut travels to a planet with intelligent life. The astronaut saw numerous math equations written in the planet, and deduced that they were using a different set of notation. He saw the following arithmetic equations:

23 + 6 = 11 23+6=11
33 + 9 = 15 33+9=15
35 + 12 = 11 35+12=11
65 9 = 2 65-9=2
26 2 = 6 26-2=6
56 24 = 5 56-24=5
6 × 8 = 24 6\times 8=24
20 × 12 = 60 20\times 12=60
60 × 24 = 120 60\times 24=120
52 ÷ 42 = 2 52\div 42=2
69 ÷ 24 = 3 69\div 24=3
202 ÷ 101 = 101 202\div 101=101
32 = 6 \left| 32 \right| =6
55 = 10 = 1 \left| 55 \right| =\left| 10 \right| =1
82 + 3 = 10 + 3 = 1 + 3 = 4 \left| 82+3 \right| =\left| 10+3 \right| =\left| 1+3 \right| =4
36 23 = 9 5 = 4 \left| 36-23 \right| =\left| 9-5 \right| =4
6 × 8 = 24 \left| 6\times 8 \right| =24
20 × 12 = 60 \left| 20\times 12 \right| =60
52 ÷ 42 = 2 \left| 52\div 42 \right| =2
69 ÷ 24 = 3 \left| 69\div 24 \right| =3

In order for him to gain an audience with the ruler, he needs to solve this equation using these same rules:

32 ÷ { 36 [ 58 + ( 32 × 3 ) ] × [ 45 + ( 36 2 ) ] } . \left| 32\div \left\{ 36-\left[ 58+\left( 32\times 3 \right) \right] \times \left[ 45+\left( 36-2 \right) \right] \right\} \right|.

Help him to solve this strange problem.

Hint : To find logic in these equations, you can use LCM, GCD, and the sum of the digits of these numbers.
The order of operations is the same on this planet and on Earth: First the parentheses, after the brackets, braces, multiplication, division, etc.


The answer is 1.

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1 solution

Justin Wong
Apr 15, 2014

The logic of this planet is as follows:

  1. For a + b a+b , take the sum of digits of a a and the sum of digits of b b and add them together.

  2. For a b a-b , do the same as 1 except subtract the sums.

  3. a × b a \times b = LCM of a , b a,b

  4. a / b a/b = GCF of a , b a,b

  5. a b |a * b| where * is an operation means keep performing until the result is a single digit.

Exactly!

Victor Paes Plinio - 7 years, 1 month ago

What do you mean by keep performing? Also |6×8|=24 and that's not a single digit.

Oras Phong - 7 years, 1 month ago

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He forget to say it. The absolute value of a multiplication or division not change. But in addition or subtraction have a change: you should add all digits of the number until get a single number and make a normal addition or subtraction.

Victor Paes Plinio - 7 years, 1 month ago

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Yeah, sorry about forgetting that. Thanks for the fun problem Victor!

Justin Wong - 7 years, 1 month ago

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@Justin Wong Thanks

Victor Paes Plinio - 7 years, 1 month ago

Thanks! Also, if I'm not mistaken, the first three clues seem like that the + symbol could mean the first value substracted by the double of the second value. For example

23 + 6 = 23 12 = 11 23 + 6 = 23 - 12 = 11 33 + 9 = 33 18 = 15 33 + 9 = 33 - 18 = 15

So I stuck with that, and didn't get the answer...

Oras Phong - 7 years, 1 month ago

It would have been better if the hint wasn't given

Beakal Tiliksew - 7 years, 1 month ago

I wonder why |32| = 5 and |36-23| = |9-5| = 3

Kenrick Anggara - 7 years, 1 month ago

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I made a mistake. |36-23| = |9-5| = 4.I already solved this mistake. Sorry.

Victor Paes Plinio - 7 years, 1 month ago

And how is |9-5 |= 3 and|3+1| = 4 ?

Karttikeya Mangalam - 7 years, 1 month ago

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sorry. I go repair it

Victor Paes Plinio - 7 years, 1 month ago

the most complicated question

Ch Muhammad Uzair - 7 years, 1 month ago

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