It takes you 40 seconds to walk from the first (ground) floor of a building to the third floor. how long will it take to walk from the first floor to the sixth floor (at the same pace, assuming that all floors have the same height)

40 seconds - 1st floor, 2nd floor, 3rd floor
80 seconds - 4th floor, 5th floor, 6th floor

Hope this helps!! :)

Remember, you can do anything to an equation as long as you do it to both sidesminus 36 from both sides4.5(8-x)=66-2.5(3x+24)distribute36-4.5x=66-7.5x-60add like terms36-4.5x=-7.5x+6add 7.5x to both sides36+3x=6minus 36 from both sides3x=-30divide both sides by 3x=-10