Răspunsuri

2014-04-28T19:54:18+03:00
A = numar fete
b = numar baieti
a + b = 28
b = 0,(3) a = 3/9 a = 1/3 a
a + 1/3 a = 28 (aducem la numitorul comun 3,amplificand prima fractie cu 3)
3a/3 + a/3 = 28
4a/3 = 28
a = 21
b = 28 - 21 = 7
2014-04-28T19:55:35+03:00