Though this problem may seem complicated, it is very simple.
1+3+5+7+9+11+13...+69=1225
Also:
S=(35/2)(2+34(2)) = 1225
1/2 x 35 x (1 + 69)
35 x 35 = 1225
(my preferred way)
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4225
You can use one of the formulae for the sum of an arithmetic progression to calculate that.
9 and 11
The sum of the first 100 odd numbers is 10,000.
The numbers are 43 and 45.