Question

45 is 90% of what number

Answer 1

45 = 90% * x
45 = .90x
45/.90 = x

x = 50

45 is 90% of 50

Answer 2

45/0.9 (Which is 90%) =50                        45 is 90% of 50

         50  <------ answer
      ____
0.9/  45
      - 45
_______
          0