A 15.0cm object is placed 60.0cm from a convex lens which has a focal lenght of 15.0cm use the thin lens equation to find the distance of the image

Question

(60)1/15=1/60+1/60(1/15)=1-1+1/d

Answer 1

I don't understand your work.

1/di+1/d0=1/f

1/di+1/60=1/15

1/di=3/60
di=20cm
check that.