40 30= 50 5

Are you asking to find the rule that maps (40, 30) to (50, 5)? If so, one clean rule that fits is:

• C = 2A − B
• D = (A − B)/2

For A = 40, B = 30:

• C = 2·40 − 30 = 50
• D = (40 − 30)/2 = 5

So (40, 30) → (50, 5).

If you want, I can:

• Check another example to test the rule, or
• Create a few similar problems for practice (e.g., with different A, B, and you try to predict C, D).