Express
as a single fraction. It'll become
Multiply 56 and 49 to get 2744.
Reduce the fraction
to its lowest terms by extracting and cancelling out 7.
- 5/392 can be written as 5 : 392 or further simplified to 0.0127.
__________
If you want the answer in 3 ratios itself, then you can do the work easily by just dividing the numbers by the common number (here it is 7).
So, 35 : 56 : 49 will become ⇨ 5 : 8 : 7.