daca vrei raspunsul direct este 400, daca nu uite aici rezolvarea
Notam cu s suma initiala a copilului.
[tex] \frac{3}{5} [/tex] x s+[tex] \frac{3}{8} [/tex]⁽s-[tex] \frac{3}{5} [/tex] x s₎ ₊100= s
[tex] \frac{3s}{5} [/tex] + [tex] \frac{3s}{20} [/tex] + 100 = s
[tex] \frac{15s}{20} [/tex] +100 = s
3s + 400 = 4s
s=400