Question

In the figure below, the ratio of AB to DE is the same as the ratio of AC to DF. Find DF.

9.5

2

4

10.5

Answer 1

10.5

Answer 2

16 14
---- = ------
12 x+1

rearranging

14 * 12
x+1 = ---------
16

so x+1 = 10.5

so DF = 10.5