Jawabanmu

2014-09-08T20:35:51+07:00
10/10+15=20/20+x
10/25=20/20+x
2/5=20/20+x
40+2x=100
2x=60
x=30
1 5 1
2014-09-08T20:35:51+07:00
10/15 = 20/x
X=30
Itu pake perbandingan