Question

Aflati numere x si y stiind ca sunt direct proportionale cu 5 si 7 si ca media lor aritmetica este 29,4

Answer 1

x/y=5/7
(x+y):2=29,4
x+y=29,4*2
x+y=58,80
x=5y/7
5y/7+y=58,80
5y+7y=58,80x7
12y=411.60
y=411.60:12
y=34,30

x+34,30=58,80
x=58,80-34.30
x=24,50