Răspuns :
elevi care sar coarda =aelevi care alearga =ba-b =36a:b =5 a=5xb5xb - b =364xb = 36b =36:4b=9 a-9=36a=36+9a=45
a-b=36
a:b=5
a=5b
5b-b=36
4b=36
b=9 elevi sar coarda
a=5x9=45 elevi alearga
a:b=5
a=5b
5b-b=36
4b=36
b=9 elevi sar coarda
a=5x9=45 elevi alearga