60
30 *2
15 * 2 * 2
5 * 3 * 2 * 2
Pretty simple, really - all you have to do us divide 509 by 14 before you're left with an answer of <span>36.35. Now, the number '36' is closer to 0 than 100, so we'll round down instead of up, therefore the number of floors to the building is 36! </span>
24% of 225 is 54, so you do 225+54=279 so 279 is the correct answer :)
