The master received the order for repair of 18 alarm clocks. Daily it repaired 5 alarm clocks. Calculate how many alarm clocks it needed to repair after three days of work. Replace in a condition number 5 with number 6. Answer a question: For how many days did the master execute the order?

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1 way 5•3=15 (b.) made in 3 days of work 18-15=3 (b.) it was necessary to make after 3 days of work the 2nd way 18:6=3 () was required on performance of the заказа18th (5×3)=3 of the alarm clock it was necessary to repair 18-(6×3)=0, means in 3 days it will execute all order
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