Step 1: Decode the given system.
From the mappings in the image:
- 0 = Green Green Green
- 3 = Green Green Blue
- 10 = Green Blue Green
- 21 = Red Blue Green
- 23 = Blue Red Blue
- 24 = Blue Blue Green
Step 2: Identify the multiplication numbers.
On the right-hand side: Left = Red Green Green, Right = Green Green Blue.
From mapping:
- Red Green Green corresponds to 21.
- Green Green Blue corresponds to 3.
Step 3: Multiply.
\[
21 \times 3 = 63
\]
Final Answer:
\[
\boxed{63}
\]