Question 1115527
n/L=3
n=3L


{{{(3L-15)/L=7/4}}}, ratio of LEMONS to ORANGEs became  7:4.


{{{4(3L-15)=7L}}}

{{{12L-60=7L}}}

{{{5L=60}}}

{{{L=12}}}-----------initial lemons in the box

{{{36}}}------------initial oranges in the box

-


21 oranges remained, and 12 lemons remained.
Total 33 pieces.