`[8xx10xx5xx9xx7]/[16xx20xx15xx3]`
`=[8xx10xx5xx3xx3xx7]/[8xx2xx2xx10xx5xx3xx3]`
`=7/[2xx2]=7/4`
8x10x5x9x7 8x10x5x9x7 7 7
---------------- = -------------------- = ------------------- = ---
16x20x15x3 8x2x10x2x9x5 2x2 4
\(\dfrac{8\times10\times5\times9\times7}{16\times20\times15\times3}\)
\(=\dfrac{1\times1\times1\times3\times3\times7}{2\times2\times3\times3}\)
\(=\dfrac{1\times1\times1\times7}{2\times2}\)
\(=\dfrac{7}{4}\)
