n an average the income for 15 days is $7, average for the first 5 days is $6 and the average for the last 9 days is $8. what is the income on the sixth day?
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Answer:31.2
Step-by-step explanation:rate of the income = average/ no. of days
so we use 6/5 as the rate . Then for sixth day he should have 6*5+6/5
= 31.2
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