An office building is 3 stories tall. there are 20 offices on the first floor. there are 6 more offices on the second floor than on the first floor, and there are 2 more offices on the third floor than on the second floor. how many offices are there in all?
a: 28
b: 32
c: 60
d: 74

Your answer would be D: 74
This is because, if you go through it in your head, you get that the first floor has 20 offices, the second floor has (20 + 6) offices and the third floor has (20 + 6) + 2 offices. When you actually do those sums, you get 20, 26, and 28, and so when you add up all of those values, your final answer is 74.

I hope this helps!

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