Bonjour,
6)
300 /500
et 200/500
=> 2: 3
7)
7+3 = 10
100/10 = 10
ratio 7: 10*7 => 70 noisettes
ratio 3: 10*3 => 30 noisettes
8)
1cm -> 50 000cm
2 cm -> 50 000*2 = 100 000 cm = 1km
