Answers

2016-01-26T20:13:27+05:30
If 3+5=2 then 100-50=150

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2016-01-26T20:19:06+05:30
As in 1st eqn you considered + as - so now it will be + as there is - therefore   100-50= 150
1 5 1
i think ans is -50 as -3+5=2 so -100+50=-50