(surplus+deficit) ÷ (the difference between two distributions per person) = number of people.

For example, "children divide peaches, each person 10, 9 less, and 8 more 7s per person." Q: How many children and peaches are there? "

Solution (7+9)÷( 10-8)= 16÷2

=8 (a) ........................................................................................................................................................................

10×8-9=80-9=7 1 (pieces)

Or 8×8+7=64+7=7 1 (pieces) (omitted)

(2) Both times are surplus (surplus), and the formula can be used:

(large surplus-small surplus) ÷ (the difference between two distributions per person) = number of people.

For example, "soldiers carry bullets for marching training, each carrying 45 rounds and more than 680 rounds; If each person brings 50 rounds, then 200 rounds more. Q: How many soldiers are there? How many bullets are there? "

Solution (680-200)÷(50-45)=480÷5

=96 (person)

45×96+680=5000 (hair)

Or 50×96+200=5000 (hair) (omitted)

(3) If twice is not enough (loss), the formula can be used:

(big loss-small loss) ÷ (the difference between two distributions per person) = number of people.

For example, "send a batch of books to students, each with 10 copies, with a difference of 90 copies;" If each person sends 8 copies, there are still 8 copies left. How many students and books are there? "

Solution (90-8)÷( 10-8)=82÷2.

=4 1 (person)

10×4 1-90=320 (this) (omitted)

(4) If one time is not enough (deficit) and the other time is just used up, you can use the formula:

Loss = number of people.

(Example omitted)

(5) One time there is surplus, and the other time it is just used up. This formula can be used to:

Surplus (the difference between two distributions per person) = number of people.

(Example omitted)