Bonjour,
1C + 1P = 200g
500 +1C = 320 + 1P
1P = 200 -1C
500 +1C = 320 +200 -1C
500+1C = 520 - 1C
1C + 1C = 520 - 500
2C =20
1C = 20/2 = 10
1C+ 1P =200
1P = 200 -10
1P = 190
=>
cerise: 10g
poire:190g
vérif
1° balance
200 = 10 +190
2° balance
500 + 10 =320 + 190
510 =510