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BC= b
CD= c
⇒AD = 6BC ⇒ AB+CD =50
a +b+c = 6b a + c = 50
a+c = 6b -b
a+c = 5b
50 = 5b
10 = b
* hallar AD
AD = a+b+c
b =10
a+c =50
*50 + 10 = 60