Question

Me he confundido :(

Answer 1

3,5%=0,035=35/1000=7/200
4%=0,04=4/100=1/25
5%=0,05=5/100=1/20
0,5%=0,0005=5/10000=1/2000
87%=0,87=87/100

lactosa y proteínas:
7/200 + 1/20=7/200 +10/200=17/200=0,085=8,5%