Răspuns :
120 pg .......... 4/7
x pg ...............7/7
120 x 7/7 = 120 x 7/4 = 210 pagini are cartea
4/7
sau
4/7 x X = 120
7)
4X/7 = 120
4X = 840
X = 840 : 7
X = 210 pagini
x pg ...............7/7
120 x 7/7 = 120 x 7/4 = 210 pagini are cartea
4/7
sau
4/7 x X = 120
7)
4X/7 = 120
4X = 840
X = 840 : 7
X = 210 pagini