Respuesta :
This problem can solve by the rule of three.
42 installations-----------------------6 hours
147 installations---------------------- x
x=(147 installations * 6 hour) / 42 installations=21 hours.
Answer: 21 hours.
42 installations-----------------------6 hours
147 installations---------------------- x
x=(147 installations * 6 hour) / 42 installations=21 hours.
Answer: 21 hours.