Sid painted 10 portraits every 30 hours at the rate how long will it take to paint three portraits

9 hours

Step-by-step explanation:

10 portraits in 30 hours, let's write it mathematically

10p=30h then 1p = (30/10) h = 3 h three hours for a single portrait

therefore for 3 portraits he will take three times 3 hours

3p=3*3h = 9 hours