Răspuns :
a-primul raft=x
b-al doilea raft=3 • x
c-al treilea raft=(3•x)-5
a+b+c=86
x+3x+3x-5=86=>7x-5=86=>7x=86+5=>7x=91=>x=91:7=>x=13
a=13 carti
b=3•x=3•13=39 carti
c=(3•x)-5=(3•13)-5=39-5=34
13+39+34=86 carti
coroana?
notam a=primul raft, b=al doilea si c= al treilea raft
a+b+c=86
a= ?
b= 3 x a
c= 5
=> a+3a+5=86
4a+5=86
4a=86-5
4a=81 => a=81/4 = 20,25, dar aproximam la 20 de carti
b=3x20,25= 60,75, dar aproximam la 61 de carti
Verificare:
20+61+5=86 => 86=86
a+b+c=86
a= ?
b= 3 x a
c= 5
=> a+3a+5=86
4a+5=86
4a=86-5
4a=81 => a=81/4 = 20,25, dar aproximam la 20 de carti
b=3x20,25= 60,75, dar aproximam la 61 de carti
Verificare:
20+61+5=86 => 86=86