Question

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

Answer 1

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!

Answer 2

first floor = 20 second floor = 20 + 6 = 26 third floor = 26 + 2 = 28 20 + 26 + 28 = 74 offices

So:D XDD