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base = b
b = 3h
area original bh
area amentada (b+5)(h+5)
aumento = (b+5)(h+5) -bh = 185
bh + 5b +5h + 25 -bh = 185
5b + 5h = 185 -25
5b + 5h = 160
Simplifica dividiendo entre 5
b + h = 32
Ahora usamos b = 3h
3h + h = 32
4h = 32
h = 8
b = 3*8 = 24
Respuesta: base 24 cm y altura 8 cm