Question

in excursie au plecat 54 de elevi si adulti.stiind ca au plecat de 2 ori mai multi baieti decit fete si cu 6 adulti mai putini decit fete ,aflati numatul baietilor care au plecat in excursie

Answer 1

a=adulti, b=baieti, f=fete; a+b+f=54; b=2f => f=b/2; f=a-6; b/2=a-6 => a=b/2+6; b/2+6+b+b/2=54 <=> b+b=54-6 <=> 2b=48 => b=24