What operations replace each to make the equation above true?
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According to the B O D M A S rule division should be done first
thus we see in L.H.S that 12 is only divisible by 4(since R.H.S is an integer) so thus we are confirmed that in second ? mark it would be division sign . (ans 3)
now the second step should be done is multiplication
thus we can see that if we multiply 3 by 5 the product would be small and R.H.S contains huge term.Thus the first ? mark should be plus sign
now just we have to see the option