1 ban co so hoc sinh ngoi la :
40 : 10 = 4 ( hoc sinh )
Co them so bo ban ghe la :
12 - 10 = 2 ( bo )
Co them so hoc sinh la :
2 * 4 = 8 ( hoc sinh )
D/S : 8 hoc sinh
1 ban co so hoc sinh ngoi la :
40 : 10 = 4 ( hoc sinh )
Co them so bo ban ghe la :
12 - 10 = 2 ( bo )
Co them so hoc sinh la :
2 * 4 = 8 ( hoc sinh )