Răspuns :
40/100 × x=160(simplificam 40/100 cu 20)
2/5x=160|×5/2
1/2×2x=5/2×160
x=5/2×160(simplificam 2 si 160 cu 2)
x=5×80
x=400
40/100 × x=160(simplificam 40/100 cu 20)
2/5x=160|×5/2
1/2×2x=5/2×160
x=5/2×160(simplificam 2 si 160 cu 2)
x=5×80
x=400