Question

15 supra 5·(1-1pe5) = 1 pe x

Answer 1

15(1-1/5)=1/x
15 ori 4/5=1/x
12=1/x
x=1/12

Answer 2

15/5(1-1/5)=1/x
15/(5-5/5)=1/x
15/5-1=1/x
15/4=1/x
15x=4
x=4/15