Răspuns :
a+b+c=18
a=3b
b=2c
=> 6c+2c+c=18
=> 9c=18
c= 18/9
c= 2 => b=4 => a= 12
a=pix
b=creion
c= guma
a=3b
b=2c
=> 6c+2c+c=18
=> 9c=18
c= 18/9
c= 2 => b=4 => a= 12
a=pix
b=creion
c= guma
p+c+g=18 p=3c g=1/2 ori c apoi inlocuim 3c+c+1/2 ori c=18 aducem la acelasi numitor si rezulta 6c+2c+c=36 9c=36 c=4 (caiet) g=1/2 ori4=2(guma) p=3 x 4=12(pix)