Jawabanmu

2014-08-26T11:00:02+07:00
(160+x)/15=160
160+x=240
x=240-160=80
jadi tinggi rata2 5 pelajar = 80cm
2014-08-26T11:05:49+07:00
15X160=2400
10X162=1620

2400-1620 = 780

rata2tinggi = 780/5=156