determina numerele a si b stiind ca a×b=240 si a×(b+5)=300

Răspuns :

axb=240
ax (b+5)=300
axb+5a=300
240+5a=300
5a=60=>a=12
b=20
a×(b+5)=300
ab+5a=200
240+5a=300
5a=60
a=12
b=240:12
b=20