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In the given below question substitutes ...

In the given below question substitutes for various mathematical symbols, followed by a question involving calculation of an expression is given. put the real signs in the given equations and solve the questions-
If `+` means `div` ,`div` means `-`,`-` means `xx` and `xx` means +, then
`12 + 2 xx 9 div 4 = ?`

A

9

B

11

C

4

D

15

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