Verified Answer :

Answer=7.5ft

The mural was 25ft long

Length=25ft

The height was 3/10 of the length
height=3/10length

Since we know the length, lets solve for the height.

height=3/10
25=7.5ft

The height was 7.5ft.

25 ft* (3/10)= 7.5 ft.

The mural was 7.5 ft high~