DEllAC
AB=24
BE=15
EC=21
DB=X
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using BPT
BD/ AD = BE/EC ....( since, DE||AC)
x / (24-x) = 15/21
=> x / (24-x) = 5/7
=> 7x = 120 -5x
=> 12x = 120
=> x = BD = 12cm
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