Question

va rog ex 15 va rog​

Answer 1

Răspuns:

1kg castarveti costa 2,50lei

1kg rosii costa 3,5lei

Explicație pas cu pas:

3kg rosii...5kg castraveti...23lei

4kg rosii...3kg castraveti...21,50lei

Daca amplificam primul enunt cu 4 si al doilea enunt cu 3, obtinem:

12kg rosii...20 kg castraveti...92 lei

12kg rosii...9kg castraveti...64,50lei

Scazand al doilea din primul, obtinem:

20-9=11kg castarveti...92-64,5=27,50lei

1kg castarveti va costa  27,50÷11=2,50lei

3kg rosii...23-5×2,50=23-12,50=10,50lei

1kg rosii va costa 10,50÷3=3,5lei

Answer 2

3 kg mere.....5kg castraveti.....23lei|×4

4 kg mere...3kg castraveti..21,50lei|×3

12kg m.....5kg castraveti...92lei

12kg m.....3kg c.......92lei

/......5kg c ....91lei

/......1kg c .....91÷5=18,2