Answer:
3 : 4
Explanation:
900 : 1200
= 30 x 30 : 30 x 40
= 30 : 40
= 3 x 10 : 4 x 10
= 3 : 4
4:3
Let's say that the number we multiply to get to 1200 from 900 is x.
900x=1200
Now, we divide both sides by 900:
x=1200/900
x=4/3
The number is 4/3. In ratio form, this is 4:3
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