Assuming that the nine balls scored are all 2-pointers, then

9*2= 18 points

This assumption is 3 points less than the actual score.

2 1- 18=3 points

Because the three-pointer is assumed to be a two-pointer, one point is missing.

One-third * * * Suppose three three-pointers are two-pointers.

3/(3-2)=3 (piece)

So, I hit three threes and six twos.

There are two hypothetical ways: one is to assume that 3-pointers are also 2-pointers, and then calculate the number of 3-pointers;

The other assumes that the 2-point ball is a 3-point ball, then calculate the number of 2-point balls (there is such a solution formula above).