India, May 3 -- Maths has always been a subject that many of us found challenging during school times. It was the subject that either had us groaning in frustration or, for some, reaching for a calculator. However, that's not the case when it comes to brain teasers that involve a bit of maths. If you're a fan of brain teasers and enjoy a good mental workout, then we have just the treat for you.

(Also read: Brain teaser: Only 2% of people with out-of-the-box thinking can solve this mind-boggling maths puzzle)

A brain teaser has grabbed the internet's attention after being shared on Facebook by the account Minion Quotes. The teaser reads: "Solve this math problem without using a calculator: 40 + 40 - 70 x 0 + 20 + 10 = ?" and ends with th...