Question

Afla numarul necunoscut (a-400):100=5 100×(a-70)=400

Answer 1

a-400=100*5                                                100*(a-70)=400
          =500                                                      a-70=400:100
                                                                          =4
   a-400=500                                                         a=70+4 = 74
a=500+400
a=900