Dividend+quotient+divisor +3=77 Dividend+quotient+divisor = 74 (formula 1)

When the dividend and divisor are both ×8, the quotient remains unchanged.

8× dividend+quotient +8× divisor +3×8=567 8× dividend+quotient +8× divisor =543(②)

②-① Get 7× dividend +7× divisor =469.

Divider+Divider = 67 (Formula ③)

①-③ Quotient =7 Dividend =7× Divider +3

Divider +7× Divider +3=67

Divider =8, dividend =7×8+3=59.