Question

Diana are de 5 ori mai multe bile decat Silviu.Daca Diana ar da Silviei 100 de bile, atunci ar atunci ar avea acelasi numar de bile. Cate bile are fiecre?

Answer 1

$D=5S \\ D-100=S+100 \\ D=S+200 \\ S+200=5S \\ 200=5S-S \\ S=200:4 \\ S=50 bile are Silvia \\ D=5*50=250 bile are Diana$

Answer 2

D = 5 S

D - 100 = S + 100

5 S - 100 = S + 100

5 S - 200 = S

5 S - S = 200

4 S = 200

=> S = 200 : 4

S = 50

D = 50 * 5

D = 250