You are probably studying arithmetic sequences and series
let the first term be a
common difference is -10
and the number of terms is 5
Sn = (n/2)[2a + (n-1)d]
200 = (5/2)[2a + 4(-10)]
400 = 5[2a - 40]
400 = 10a - 200
600 = 10a
a = 60
So on the first day they must sell 60 tickets
check: 60 + 50 + 40 + 30 + 20 =
assume that they will sell x tickets on the first day.
Sale on second day will be x-10
third day x-20
fourth day x-30
fifth day x-40
if we add them all up
so they have to sell 60 on the first day
50 on the second
40 on the third
30 on the fourth
and 20 on fifth day.
find the difference using model subtraction with renaming
The product of a number and seven increased by twenty-three is equal to one hundred seven.
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