Question

Which proportion can be used to find the measure of DE?



12/x = 16/15

12/16 = 15/x

12/15 = x/16

12/16 = x/15

Answer 1

12/16 = 15/x

other: x/16 = 15/12; x/15 = 16/12; x/(x+15)=16/(16+12) ;)

12/16 = 15/x  |cross multiply
12x = 15 · 16
12x = 240  |:12
x = 20