Question

Aflati numarul x stiind ca :
140 reprezinta 20% din x
18.4 reprezinta 120% din x
0,35 reprezinta 0,5% din x
1,(8) reprezinta 0,2(7)% din x


Va roooooooooggggg dau coroana si. 10 pct!!!

Answer 1

140= 20% × x           x=140:20%=140×100/20=700
18.4 =120% ×x         x=18,4:120%=18,4×100/120=184/12=46/3=15,(3)
0,35 =0,5% ×x          x=0,35:0,5%=0,35×1000/5=70
1,(8) =0,2(7)% × x  
1,(8)=(18-1)/9=17/9
0,2(7)=(27-2)/90=25/90
 x=17/9: 25/90%=17/9×9000/25=17×40=680