Question

1.Media aritmetica a trei numere naturale x ,y ,z este 28 .Determinati suma lor
2.Aflati numarul natural x daca; 3+6+9+...+297=150x

Answer 1

1) ma=(x+y+z)/3=28

x+y+z=3*28
x+y+z=84

2) 3+6+9+..+297=150x

n=(297-3):3+1
n=294:3+1
n=98+1
n=99

(3+297)*99/2=150x

300*99/2=150x

150*99=150*x

x=99