math

i need help!!!!:

when you divide my fraction by yours

"my" / "yours" = 40

my / yours = 40
multiply both sides with "yours"

my / yours *yours = 40 * yours
my = 40 * yours
divide both sides by "my"
my/my = 40 * yours/my
1 = 40 * yours/my
divide both sides by "40", then:
yours / my = 1/40 = 0.025

[input]1/40[/input]

thank you soooo much