Respuesta :

helen2007

Answer:

3 minutes

Step-by-step explanation:

think of 12 and 9 as a fraction 12/9 and then 4 and x (the number we are looking for) 4/x

12÷3=4 and 9÷3=3

so heather can ring up 4 costumers in 3 minute

hope this helped

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