Răspuns :
Răspuns:
a=2i
4i+6a=240
4i+6×2i=240
4i+12i=240
i=240:16=>i=15 probleme a rezolvat Irina
a=2×15=>a=30 probleme a rezolvat Ana
verificare:
4×15+6×30=60+180=240 probleme
Răspuns:
a=2i
4i+6a=240
4i+6×2i=240
4i+12i=240
i=240:16=>i=15 probleme a rezolvat Irina
a=2×15=>a=30 probleme a rezolvat Ana
verificare:
4×15+6×30=60+180=240 probleme