Question 848340
First convert each mixed number into improper fraction:


{{{1&3/8=1+3/8=8/8+3/8=highlight_green(11/8)}}}


{{{1&7/8=1+7/8=8/8+7/8=highlight_green(15/8)}}}


Next form the ratio asked:


{{{(11/8)/(15/8)}}}


Multiply numerator AND denominator by {{{1=8/8}}}.
RESULT:   {{{highlight(highlight(11/15))}}}