Question

Simplify the ratio 40:16:80 --:--:--

Answer 1

The ratio is : 40 : 16 : 80
To simplify the ratio we will divide each number by 8:
Answer:  5 : 2 : 10.

Answer 2

Look for numbers with which you can divide all the numbers. 
40, 16 and 80 are all divisible by 2. So do that. 
Then you get 20:8:40 
Do that until you can't divide anymore with any number.