Hello

I have a problem I need help with. I'm not sure if I am doing the problem right and my answer book only has odd numbers...

I'm supposed to find the LCD for 1/6y and 3x/4y+12 ...I'm getting 12(y+3) for the LCD but I'm confused about it. According to my logic it could also be 12y(y+3) and my friend is telling me its supposed to be 24(y+3)...Does anyone know the right answer to this?

Appreciate the help. )