Hej!
a]
[tex]x\cdot5,42=54,2\\\\x=54,2:5,42\\\\x=10[/tex]
b]
[tex]0,94\cdot x=940\\\\x=940:0,94\\\\x=1000[/tex]
c]
[tex]4,7:x=0,0047\\\\x=4,7:0,0047\\\\x=1000[/tex]
d]
[tex]x:100=0,0076\\\\x=0,0076\cdot100\\\\x=0,76[/tex]