Answer:
Ratio of e : f is 13 : 10
Explanation:
area of square E = e x e = e² cm²
area of square F = f x f = f² cm²
The area of square E is 69% greater than the area of square F
If the area of square F = 100%
then the area of square E = 100% + 69% = 169%
So the ratio of e² : f² = 169 : 100
square root both sides: e : f = √169 : √100
so e : f = 13 : 10