Question 313393
 Martin ate 100 cookies in five days. Each day he ate 6 more than the day before. How many cookies did he eat on the first day?
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Arithmetic series with S(5)=100 and d = 6.
Find a(1)
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Formula: S(n) = a(1)+(n-1)d
100 = a(1) + 4*6
a(1) = 74
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Cheers,
Stan H.