Answer:
1:5
Explanation:
To write 4: 20 in simplest form we have to find the GCF (Greatest common factor)
The GCF of 4 and 20 is 4.
we need to factor each number
(factors of 4 = 1, 2, 4)
(factors of 20 = 1, 2, 4, 5, 10, 20)
and choose the greatest factor that exactly divides both 4 and 20, i.e., 4.
Now we can divide
4: 4 = 1
20 : 4 = 5
Thus, 4: 20 in simplest form is 1:5
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