x-suma initiala
1/4 din x= 1/4 * x= x/4 -prima zi
x-x/4= (4x-x)/4= 3x/4 - restul
2/5 din 3x/4= 2/5 * 3x/4= 3x/10 -a doua zi
3x/4 -3x/10= (30x-12x)/40= 18x/40 -noul rest
1/6 din 18x/40= 1/6 * 18x/40= 3x/40 -a treia zi
18x/40-3x/40=15x/40 -noul nou rest
15x/40=76
x=40*76/15
x=202,66