The second one write it on the paper and take a picture

Answer:
The common for the second question is 30
Answer:
39/30 Here 30 will be common in denominators
Step-by-step explanation:
6/15×2/2=12/30
3/10×3/3=9/30
3/5×6/6=18/30
= 12/30+9/30+18/30
39/30