Răspunsuri

2014-09-28T19:48:48+03:00
Notam x suma Mihaelei ,iar y suma lui Mihai
x=y*7:10
y-x=30(=)y-y*7:10=30(=)y*3:10=30(=)y=30:3*10(=)y=100 =>
x=100*7:10(=)x=70 =>
Mihai are 100 de lei ,iar Mihaela are 70 de lei
2014-09-28T19:52:56+03:00
M = 7/10 M
m + 30 = M
m = 7/10* (m + 30)
m = 7m + 210
          10
10m = 7m + 210
3m = 210
m = 210 : 3
m = 70 lei
M = 70 + 30
M = 100 lei
M = Mihai
m = Mihaela