(6×7)-(8×9)-(10×11)=?

In a peculiar mathematical operation, plus means multiplication, minus means plus, divided means minus and multiplication means sum of digits of two numbers. Follow these rules and solve the following example.
(6×7)-(8×9)-(10×11)=?
(a) 04
(b) 52
(c) 224
(d) 33

Anurag Mishra Professor Asked on 26th March 2016 in Reasoning Questions.
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    Answer: (b) 52 

    Anurag Mishra Professor Answered on 11th May 2016.
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