Răspuns:
Explicație pas cu pas:
1/4 :4 = 1/16
1/16 = partea vopsita
1 -1/16= 15/16 = partea nevopsita
daca 15/16= 30
atunci 1/16 = 30 :15 = 2
30+2=32 (lungime totala teava)
sau :
VOPSIT : |...|
NEVOPSIT : |...|...|...|...|...|...|...|...|...|...|...|...|...|...|...|
TOTAL : |...|...|...|...|...|...|...|...|...|...|...|...|...|...|...|...|
15 segment = 30
1 segment = 30 : 15 =2
16 segmente = 2*16=32
succes