Math : 800 grosse valent 100 ducats . 100 grosses valent 250 tolars . Combien aura t on de ducats en échange de 100 tolars?

800 grosses = 100 ducats
100 grosses = 250 tolars

800 grosses = 250 x 8 = 2 000 tolars

100 ducats = 2 000 tolars
 ? ducats = 100 tolars
100/200 = 100 tolars
0,5 ducats = 100 tolars.