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james brought a few hamsters. for each day after the first day of the week, the hamsters at 20 grams of food than the previous...Asked by Tiffany
James bought a few hamsters. For each day after the first day of the week, the hamsters ate 20 grams of food more than the previous day. The hamsters grew fast, finishing 1260 grams of food in the first week. How much food did the hamster eat on the first day?
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Answered by
R_scott
the last day is six days from the first day
1st day = f
last day = f + 6(20) = f + 120
arithmetic series average = (1st + last) / 2 = (2 f + 120) / 2 = f + 60
for 7 days ... food = 7(f + 60) = 7 f + 420 = 1260
... 7 f = 840 ... f = ?
1st day = f
last day = f + 6(20) = f + 120
arithmetic series average = (1st + last) / 2 = (2 f + 120) / 2 = f + 60
for 7 days ... food = 7(f + 60) = 7 f + 420 = 1260
... 7 f = 840 ... f = ?
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