Question

aflati nr a si b, stiind ca sunt invers proportionale cu 0,2 si 0,5 iar 4a+3b=78
dau coroana

Answer 1

0,2=2/10=1/5; 0,5=5/10=1/2 => a/5=b/2=k => a=5k si b=2k. =>20k+6k=78 =>26k=78 => k=3 => a=15 si b=6