Question

an elevator in a tall building goes up 7 floors, then down 9 floors, down 4 floors, up 8 floors, anddown 2 floors. now it is on floor 14 on what floor did the elevator start

Answer 1

It started on the same floor, floor 14

Explanation:

if it went up 7 then down 9, so negative 2 kinda, then down another 4, so negative 6, then up 8 so positive 2, then down 2, it would've started on floor 14

Answer 2

14

Explanation:

Let the floor started be 'x'

Equation:-

=> x + 7 - 9 - 4 + 8 - 2= 14

x + (+7) + (-9) + (-4) + (+8) + (-2) = 14

x + 7 - 9 - 4 + 8 - 2 = 14

x + 15 - 15 = 14

x = 14

Therefore, elevator started from 14th level.