And 4 1 contain two remainders.

One is the remainder of direct addition, and the other is the remainder contained in dividend.

4 1- 1- 1=39

This 39 includes divisor, quotient and remainder of dividend, that is, quotient × divisor.

If the quotient is known, subtract it.

39-4=35

This 35 contains divisor and quotient x divisor.

That is, (quotient+1) times of the divisor.

Divider: 35(4+ 1)= 7.

Dividend: 7×4+ 1=29

Divider = (sum-remainder× 2-quotient) ÷ (quotient+1)

Think of this as a formula and write it down.