`2/3 xx 4/5: 15/16=2/3xx 4/5xx 16/15=(2xx4xx16)/(3xx5xx15)=128/225`
\(=\dfrac{8}{15}:\dfrac{15}{16}=\dfrac{128}{225}\)
\(\dfrac{2}{3}.\dfrac{4}{5}:\dfrac{15}{16}\)
\(=\dfrac{2}{3}.\dfrac{4}{5}.\dfrac{16}{15}\)
\(=\dfrac{8}{15}.\dfrac{16}{15}\)
\(=\dfrac{128}{225}\)
`2/3 xx 4/5 : 15/16`
`=8/15 xx 16/15`
`=128/225`