Question

Daca adaug 40 unui nr el devine doimea altui nr .Stiind ca suma lor este 350 ,aflati numerele?

Answer 1

$a+b=350 \\ a+40=b/2 \\ a=b/2-40 \\ b/2-40+b=350 .amplificam \\ b/2-80/2+2b/2=700/2 \\ 3b=700+80 \\ b=780:3 \\ b=260 \\ a=260:2-40 \\ a=90$