Answer:
1:5
Explanation:
find the LCF
multiples of 20: 1, 2, 4, 5, 10, 20
multiples of 4: 1, 2 4
the lcf is 4
20 ÷ 4=
5
4 ÷ 4=
1
the original ratio would be 4:20
divide by 4
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