Question

X/3=13a in baza 10/15,13a divide 9

5/x=12/45a in baza 10,45a divide 10

3/22=x/aa in baza 10,aa=nr prim
1/7=a/x,a este divizor propiu al lui 49

Answer 1

x/3=13a/15;    9|13a =>a=5 (1+3+5=9)
x/3=135/15
x/3=9 =>x=3•9
x=27

5/x=12/45a;  10|45a =>a=0
5/x=12/450
5/x=2/75
2x=5•75
x=375/2

3/22=x/aa,  aa prim=>aa=11
3/22=x/11
22•x=3•11  |11
x=3/2

1/7=a/x,  a este divizor propiu al lui 49 => a=7
1/7=7/x
x=49