In November 2009, the number of visitors to a zoo increase daily by 20. the total of 12300 people visited the zoo in that month, find the number of visitors on 1st November 2009.
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Answered by
148
d=20
Sn=1230
since November has 30 days
S30=1230
a?
S30=30/2 (2a +29d)
12300=15 (2a+29×20)
12300/15=2a+580
820-580=2a
a=240/2
=120
Sn=1230
since November has 30 days
S30=1230
a?
S30=30/2 (2a +29d)
12300=15 (2a+29×20)
12300/15=2a+580
820-580=2a
a=240/2
=120
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