3/5 of the buttons in a box are white and 1/4 are black. The remaining 9 buttons are blue. How many buttons are in the box?

Answer 1

36 white buttoms

15 black

9 blue

total 60 buttons

3/5 x 60 = 36

1/4 x 60 = 15

1 -3/5 -1/4 = 1-12/20 - 5/20 = 1-17/20 = 3/20

3/20 x 60 = 9