How high is a tree that casts a 26​-ft shadow at the same time a 8​-ft post casts a shadow which is 11​-ft ​long?

Answer 1

12 ft
x/26 = 6/13
13x = 26*6
13x = 156
x = 156/13
x = 12

Answer 2

6/13 ?? where did that come from?

x/26 = 8/11