`3/5 : 1/6 + 3 : 5 + 6/10 x 12 + 12/20`
`= 3/5 xx 6 + 3/5 + 3/5 xx 12 + 3/5`
`= 3/5 xx 6 + 3/5 xx 1 + 3/5 xx 12 + 3/5 xx 1`
`= 3/5 xx( 6 + 12+ 1 + 1)`
` = 3/5 xx 20`
`= 60/5`
` = 12`
`3/5 : 1/6 + 3:5 + 6/10 xx12 + 12/20`
`=3/5 xx 6 + 3/5 + 3/5 xx12 + 3/5`
`=3/5 xx (6+1+12+1)`
`=3/5 xx20`
`=12`
\(\dfrac{3}{5}:\dfrac{1}{6}+3:5+\dfrac{6}{10}.12+\dfrac{12}{20}\)
\(=\dfrac{3}{5}:\dfrac{1}{6}+\dfrac{3}{5}+\dfrac{6}{10}.\dfrac{12}{1}+\dfrac{12}{20}\)
\(=\dfrac{3}{5}.\dfrac{6}{1}+\dfrac{3}{5}+\dfrac{72}{10}+\dfrac{12}{20}\)
\(=\dfrac{18}{5}+\dfrac{3}{5}+\dfrac{72}{10}+\dfrac{12}{20}\)
\(=\dfrac{72}{20}+\dfrac{12}{20}+\dfrac{144}{20}+\dfrac{12}{20}\)
\(=\dfrac{240}{20}=12\)