It's for Vietnamese 8 year olds. All you need to do is place the digits from 1 to 9 in the the grid.
Can you do the maths puzzle for Vietnamese eight-year-olds that has stumped parents and teachers? | Science | The Guardian
It's for Vietnamese 8 year olds. All you need to do is place the digits from 1 to 9 in the the grid.
Can you do the maths puzzle for Vietnamese eight-year-olds that has stumped parents and teachers? | Science | The Guardian
What is the ":" sign for? Should be easy to work your way back from the 66 number and reverse all the operators.
The ":" represents a ratio which means division. Also, the question does not say you have to use all the digits between 1 and 9, so you can repeat, which makes it easier. But the only way to solve for it is trial and error.
A+13xB/C+D+12xE-F-11+GxH/I-10 = 66 which simplifies down to A + (13B/C) + D + 12E - F + (GH/I) = 87 since order of operators matter. One can also assume B/C and GH/I must be integers and not fractions to keep it simpler.
If you can repeat numbers then I think it is age appropriate. If you can only use each number once then there is a little bit of strategy involved. But obviously there is more than one answer (since A and D are interchangeable as are G and H).
Using Excel and a little bit of trial and error - 531726984 is one solution.