Question

ajutttoooooorrrrr!!!!!!!!!!

Answer 1

e= nr elevilor participanti

cati au primit premiul I = e*15/100=3e/20, restul concurentilor=e-3e/20=17e/20

cati au primit premiul II = (17e/20)*(30/100)=(17e/20)*(3/10)=51e/200

a) cati elevi au participat la concurs e=3e/20+51e/200+60+59, numitor comun 200

200e=30e+51e+12000+11800

200e-81e=23800, 119e=23800, e=23800/119=200 elevi

b) cati elevi au primit premiul II = 200*51/200= 51 elevi

c) cati elevi au primit premiul I =3e/20=3*200/20=600/20=30 elevi

raportul dintre numarul elevilor care au primit premiul I si cei care au primit premiul III = 30/60=1/2