Answer:
x = 24.75
Explanation:
28/8 = 2x+3/15
420 = 16x +24
396 = 16x
2(24.75) +3 =
49.5 + 3 = 52.5
x=9
let's find the scale factor of the enlargement ∆ABC of ∆ADE
k=28/20=7/5 or 1.4
Now k×|AD|=|AB|
Therefore
k×|DE|=2x+3
7/5×15=2x+3
21=2x+3
21-3=2x
2x=18
let me know if I was right
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