Question

At the bank of a river, by measurement, a = 9 ft., b = 15 ft., c = 12 ft., and d = 7 ft.
How long is x? How long is y?

Answer 1

so a:c = d:y = b:x

or 9/12 = 7/y

or 12/9 = y/7 and solve as before.

Also, you get 9/12 = 15/x