If $+$ means $-$, $-$ means $\times$, $\times$ means $÷$, $÷$ means $+$, then what will be the value of the following expression?
$$145÷96\times 12+13=?$$

According to the problem statement, the signs are substituted as follows:
* $÷\to +$
* $\times \to ÷$
* $+\to -$

Given expression:

$$145÷96\times 12+13$$

Substituting the operational signs:

$$145+96÷12-13$$

Applying the BODMAS rule:

1. Division ($÷$):

$$96÷12=8$$

Expression becomes: $145+8-13$
2. Addition ($+$):

$$145+8=153$$

Expression becomes: $153-13$
3. Subtraction ($-$):

$$153-13=140$$

Hence, the value of the expression is $140$.