Step-by-step Solution:

Quick Solution

This puzzle requires us to first substitute the mathematical operators with their new meanings and then solve the resulting expression using the standard order of operations (BODMAS/PEMDAS).

1. Substitute the Operators

The given substitutions are:

• + becomes *
• - becomes +
• * becomes /
• / becomes -

Applying these to the original expression 6 - 9 + 8 * 3 / 20, we get the new expression:

6 + 9 * 8 / 3 - 20

2. Solve the New Expression

Now, we solve the new expression following the standard order of operations (doing multiplication and division before addition and subtraction):

6 + (9 * 8) / 3 - 20
= 6 + 72 / 3 - 20
= 6 + 24 - 20
= 30 - 20
= 10

Final Answer: The value of the expression is 10.