Problema Solution
for the past three months,Grace used her cell phone 43 minutes,62 minutes,and 57 minutes. How many minutes would she have to use her cell phone this month for average usage over the four months to be 55 minutes
Answer provided by our tutors
Let 'x' represent the number of minutes Grace used her phone during the fourth last month.
The average usage over the four months needs to be 55 minutes means:
(1/4)(43 + 63 + 57 + x) = 55
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click here to see the equation solved for x
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x = 57 min
The last, fourth month, Grace would have to user her cell phone for 57 minutes.