#andy

\[\begin{array}{*{20}{l}}
{1)}\\
{a)\left( {152\dfrac{2}{4} - 148\dfrac{3}{8}} \right):0,2 = x:0,3}\\
{ \Leftrightarrow \left( {\dfrac{{305}}{2} - \dfrac{{1187}}{8}} \right):0,2 = x:0,3}\\
{{\rm{\;}} \Leftrightarrow \dfrac{{33}}{8}:0,2 = x:0,3}\\
{{\rm{\;}} \Leftrightarrow \dfrac{{165}}{8} = x:0,3}\\
{ \Leftrightarrow x = \dfrac{{99}}{{16}}}\\
{b)\left( {85\dfrac{7}{{30}} - 83\dfrac{5}{{18}}} \right):2\dfrac{2}{3} = 0,01x:4}\\
{ \Leftrightarrow \left( {\dfrac{{2557}}{{30}} - \dfrac{{1499}}{{18}}} \right):\dfrac{8}{3} = 0,01x:4}\\
{ \Leftrightarrow \dfrac{{88}}{{45}}:\dfrac{8}{3} = 0,01x:4}\\
{ \Leftrightarrow \dfrac{{11}}{{15}} = 0,01x:4}\\
{ \Leftrightarrow \dfrac{{44}}{{15}} = 0,01x}\\
{ \Leftrightarrow x = \dfrac{{880}}{3}}
\end{array}\]

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