Social media users often find themselves drawn to maths-related brain teasers. Reason? It helps them to unwind and take a break from the stresses of daily life. What’s more, puzzle enthusiasts have to solve it solely from mental calculations without using a calculator or pen and paper

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Answer:

According to BODMAS rule, first we will multiply 11 by 11 which= 121 which would be further subtracted by 11 [there is a rule which says that we have to solve from left to right if there is addition, subtraction or multiplication, division and here we have 11-121+11 and hence we would solve 11-121 first.. ] So, we would have -110 and then finally add to 11 which would give -99

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