A man ate 140 bananas in 5 days.Each day he ate one banana more than previous day.How many bananas he ate the first day?
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Answer:
26 bananas.
Explanation:
Given S5= 140
d=1
a=?
s5=5/2 (2a+4d)
140 = 5/2 (2a +4(1))
280= 5 (2a + 4)
56 = 2a + 4
52 = 2a
a = 52/2
a= 26
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