a-b=40
b:a=6 rest 5 ⇒b=ax6+5
a /____/
b /____/____/____/____/_____/______/......⁵./
/....................................................../ partea punctata reprezinta diferenta numerelor care este 40 ⇔a =(40-5):5=35:5=7
a=7 si b=6x7+5=42+5=47, b=47
verificare 47-7=40