Yin's cellphone plan costs $30 a month. She used 12.5 hours in May. About how many calls did Yin make in May?
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To calculate the number of calls Yin made in May, we need to know the average duration of each call.
Let's assume the average call duration is 1 hour.
In that case, she made 12.5 calls in May since she used 12.5 hours and the average duration of each call is 1 hour.
However, if the average duration of each call is different, you will need to divide the total duration (12.5 hours) by the average duration of each call to get the estimated number of calls made in May.