There are 232 phones she has left to repair at the end of the
fifteenth day of the month
Step-by-step explanation:
The given is:
1. On first day of every month, Katie gets 400 phones to repair
2. She repairs 12 phones every day after that day
3. She starts to repair the phones at the 2nd day of every month
We need to find how many phones she has left to repair at the end of
the fifteenth day of the month
∵ She gets 400 phones to repair in the 1st day of the month
∵ She starts to repair 12 phones at the 2nd day and every other day
after it
∵ She works to day 15th of the month
∴ She works for 14 days after the 1st day
∵ She repairs 12 phones each day
∴ She repairs = 12 × 14 = 168 phones
∵ The total number of the phones = 400
∴ She has left = 400 - 168 = 232 phones
There are 232 phones she has left to repair at the end of the
fifteenth day of the month
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