To find scale we have to prodive common unit, let say inches.
10 foot = 120 inch becauyse 1 foot = 12 inch so
10foot*12=120 ich
Now we know that
8 inch in drawing is 120 in real, so the scale is 8:120 or \(\frac{8}{120}= \frac{8:8}{120:8}= \frac{1}{15}\) - its the result