57th IMO in Hong Kong

Logic Level 5

5 7 I M O 2 0 1 6 I N + H O N G K O N G \large{\begin{array}{ccccccc} && & & & & 5&7\\ && & & & I & M&O\\ && & & 2& 0 & 1&6\\ && & & & & I&N\\ +&& & & H& O & N&G\\ \hline & & & & K& O & N&G\\ \hline \end{array}}

The above represents a cryptogram , each letter represents a distinct digit, and each leading digit is non-zero. Find the number of possible solutions to this cryptogram.


Image Credit: Queen Elizabeth Stadium, Hong Kong. 5 July, 2016.
IMO scores have been released. Congratulations to the medalists and top-scoring teams, and thanks to each and every team for joining us in this meaningful event.


The answer is 48.

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

2 solutions

Lolly Lau
Jul 7, 2016

7 + O + 6 + N + G = G O + N = 7 o r 17 5 + M + 1 + I + N + 2 o r 3 = N 30 > 8 o r 9 + M + I > 20 I + 2 + O = O I = 8 O 8 a n d N 8 O + N = 7 2 + H + 1 + K H + 3 = K 5 + M + 1 + 8 + N + 2 = N M = 4 G = a n y t h i n g e l s e 7+O+6+N+G=G\Rightarrow O+N=7\;or\;17 \\5+M+1+I+N+2\;or\;3=N\Rightarrow 30>8\;or\;9+M+I>20 \\I+2+O=O\Rightarrow I=8\Rightarrow O\ne 8\;and\;N\ne 8\Rightarrow O+N=7 \\2+H+1+K\Rightarrow H+3=K \\5+M+1+8+N+2=N\Rightarrow M=4 \\G=anything\;else

Given the above conditions, there are only 48 solutions that fit the equation.

Right , but maybe you should be a little more explicit in some steps.

But cute problem anyway.

A A - 4 years, 11 months ago

Hey, where can the results of the IMO be seen? Do you know? Thanks!

Manuel Kahayon - 4 years, 11 months ago

Log in to reply

Mark coordination is in progress right now :)

Lolly Lau - 4 years, 11 months ago

I suppose on the official IMO page and on the official Hong Kong imo page too.

You can search it with google suppose you'll find it easily but the results aren't published yet anyway.

A A - 4 years, 11 months ago

Log in to reply

Oh, if the results aren't out yet, then that explains it. :)

Manuel Kahayon - 4 years, 11 months ago

Oh my, I am soooo close!!

David Lin - 1 year ago

What are the 48 solutions? Can you list them all plz

Dave Seo - 4 years, 9 months ago

Log in to reply

the solutions in the form KHIMGNO are: 5284170, 6384170, 9684170, 6384270, 9684270, 5284370, 9684370, 6384570, 9684570, 5284670, 5284970, 6384970, 5284061, 5284361, 5284761, 5284961, 6384052, 9684052, 6384152, 9684152, 9684352, 6384752, 9684752, 6384952, 6384025, 9684025, 6384125, 9684125, 9684325, 6384725, 9684725, 6384925, 5284016, 5284316, 5284716, 5284916, 5284107, 6384107, 9684107, 6384207, 9684207, 5284307, 9684307, 6384507, 9684507, 5284607, 5284907, and 6384907

Abel McElroy - 4 years, 3 months ago

The solutions: 57 847 2017 80 2701 5701 57 847 2017 80 2703 5703 57 847 2017 80 2706 5706 57 847 2017 80 2709 5709 57 846 2017 81 2610 5610 57 846 2017 81 2613 5613 57 846 2017 81 2617 5617 57 846 2017 81 2619 5619 57 841 2017 86 2160 5160 57 841 2017 86 2163 5163 57 841 2017 86 2167 5167 57 841 2017 86 2169 5169 57 840 2017 87 2071 5071 57 840 2017 87 2073 5073 57 840 2017 87 2076 5076 57 840 2017 87 2079 5079 57 847 2017 80 3701 6701 57 847 2017 80 3702 6702 57 847 2017 80 3705 6705 57 847 2017 80 3709 6709 57 845 2017 82 3520 6520 57 845 2017 82 3521 6521 57 845 2017 82 3527 6527 57 845 2017 82 3529 6529 57 842 2017 85 3250 6250 57 842 2017 85 3251 6251 57 842 2017 85 3257 6257 57 842 2017 85 3259 6259 57 840 2017 87 3071 6071 57 840 2017 87 3072 6072 57 840 2017 87 3075 6075 57 840 2017 87 3079 6079 57 847 2017 80 6701 9701 57 847 2017 80 6702 9702 57 847 2017 80 6703 9703 57 847 2017 80 6705 9705 57 845 2017 82 6520 9520 57 845 2017 82 6521 9521 57 845 2017 82 6523 9523 57 845 2017 82 6527 9527 57 842 2017 85 6250 9250 57 842 2017 85 6251 9251 57 842 2017 85 6253 9253 57 842 2017 85 6257 9257 57 840 2017 87 6071 9071 57 840 2017 87 6072 9072 57 840 2017 87 6073 9073 57 840 2017 87 6075 9075 \begin{array}{rrrrr|r} 57 & 847 & 2017 & 80 & 2701 & 5701 \\ 57 & 847 & 2017 & 80 & 2703 & 5703 \\ 57 & 847 & 2017 & 80 & 2706 & 5706 \\ 57 & 847 & 2017 & 80 & 2709 & 5709 \\ 57 & 846 & 2017 & 81 & 2610 & 5610 \\ 57 & 846 & 2017 & 81 & 2613 & 5613 \\ 57 & 846 & 2017 & 81 & 2617 & 5617 \\ 57 & 846 & 2017 & 81 & 2619 & 5619 \\ 57 & 841 & 2017 & 86 & 2160 & 5160 \\ 57 & 841 & 2017 & 86 & 2163 & 5163 \\ 57 & 841 & 2017 & 86 & 2167 & 5167 \\ 57 & 841 & 2017 & 86 & 2169 & 5169 \\ 57 & 840 & 2017 & 87 & 2071 & 5071 \\ 57 & 840 & 2017 & 87 & 2073 & 5073 \\ 57 & 840 & 2017 & 87 & 2076 & 5076 \\ 57 & 840 & 2017 & 87 & 2079 & 5079 \\ 57 & 847 & 2017 & 80 & 3701 & 6701 \\ 57 & 847 & 2017 & 80 & 3702 & 6702 \\ 57 & 847 & 2017 & 80 & 3705 & 6705 \\ 57 & 847 & 2017 & 80 & 3709 & 6709 \\ 57 & 845 & 2017 & 82 & 3520 & 6520 \\ 57 & 845 & 2017 & 82 & 3521 & 6521 \\ 57 & 845 & 2017 & 82 & 3527 & 6527 \\ 57 & 845 & 2017 & 82 & 3529 & 6529 \\ 57 & 842 & 2017 & 85 & 3250 & 6250 \\ 57 & 842 & 2017 & 85 & 3251 & 6251 \\ 57 & 842 & 2017 & 85 & 3257 & 6257 \\ 57 & 842 & 2017 & 85 & 3259 & 6259 \\ 57 & 840 & 2017 & 87 & 3071 & 6071 \\ 57 & 840 & 2017 & 87 & 3072 & 6072 \\ 57 & 840 & 2017 & 87 & 3075 & 6075 \\ 57 & 840 & 2017 & 87 & 3079 & 6079 \\ 57 & 847 & 2017 & 80 & 6701 & 9701 \\ 57 & 847 & 2017 & 80 & 6702 & 9702 \\ 57 & 847 & 2017 & 80 & 6703 & 9703 \\ 57 & 847 & 2017 & 80 & 6705 & 9705 \\ 57 & 845 & 2017 & 82 & 6520 & 9520 \\ 57 & 845 & 2017 & 82 & 6521 & 9521 \\ 57 & 845 & 2017 & 82 & 6523 & 9523 \\ 57 & 845 & 2017 & 82 & 6527 & 9527 \\ 57 & 842 & 2017 & 85 & 6250 & 9250 \\ 57 & 842 & 2017 & 85 & 6251 & 9251 \\ 57 & 842 & 2017 & 85 & 6253 & 9253 \\ 57 & 842 & 2017 & 85 & 6257 & 9257 \\ 57 & 840 & 2017 & 87 & 6071 & 9071 \\ 57 & 840 & 2017 & 87 & 6072 & 9072 \\ 57 & 840 & 2017 & 87 & 6073 & 9073 \\ 57 & 840 & 2017 & 87 & 6075 & 9075 \\ \end{array}

0 pending reports

×

Problem Loading...

Note Loading...

Set Loading...