No need to solve it, you need to find a common denominator which will be the age (just check if it makes sense if there is more than one)
Hi Cosma,
Here is one way (not saying it's the only one :)
First step: get all multiples of 2 to the same high denominator:
x/6 + x/12 + x/7 + 5 + x/2 + 4 = x <=> 2x/12 + x/12 + x/7 + 5 + 6x/12 + 4 = x
Then you add them up:
2x/12 + x/12 + x/7 + 5 + 6x/12 + 4 = x <=> 9x/12 + x/7 + 9 = x
And actually your equation is equivalent to 3x/4 + x/7 + 9 = x
Then you bring it all to the same denominator which gives you 21x/28 + 4x/28 + 9 = x
And finally you have 9 = 3x/28 which is equivalent to x = 28*3 = 84
Hope this helps :)
I would find the common denominator for ALL numbers together:
Common denominator: 12 x 7
If you are more or less good with math you should have no issue, since it´s multiplications of one single digit.
Hope it helps!
Cheers,
Clara
Agree with Hugo. That's how I would do it too. :)
No need to solve it, you need to find a common denominator which will be the age (just check if it makes sense if there is more than one)