Answer:
30cm
Explanation:
5mm/10cm = 1mm/2cm
1mm/2cm = 15mm/?cm
15*2=?
length is 15mm
key:
Each 5mm is 10 cm
15/5 =3
There are 3 of 5mm
10 x 3 = 30cm
Answer=30cm
I hope this helped and that it was right.
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