x – szukana liczba
a)
0.48 * x = 3,8 |*100
48*x=380
x=\frac{380}{48}
x=7\frac{44}{48}
x=7\frac{11}{12}
b)
16\frac{2}{3}\%*x=0,6
\frac{\not50^1}{3}*\frac{1}{\not100^2}*x=\frac{6}{10}
\frac{1}{6}x=\frac{3}{5}|:\frac{1}{6}
x=\frac{3}{5}*\frac{6}{1}
x=\frac{18}{5}
x=3\frac{3}{5}
x=3,6