Question

find the value of the variable dc=12gc=9fg=18×=?

Answer 1

dc = 12

gc = 9

Then is valid proportion

DC• EC = FC • GC

Now find X = ED

ED = EC - DC

Then find

DC • EC =( 18+9) • 9

EC = 27•9/12 = 20.25

Now

X = ED = 20.25 - 12 = 8.25

Then answer is

X= 8.25