Can You Solve It With NO Calculator Or Vertical Multiplication?

A Challenging Math Puzzle

This question would be too menial and boring if we allowed the use of a calculator or vertical multiplication. In case you don’t know what multiplication is, it refers to the method of multiplying two numbers by hand where you stack the two numbers of a column.

I am sure most of us have done loads of drills on that when we were in school.

This question will really test out your most fundamental algebraic manipulation. So grab your pen and paper and give this a go, when you are ready, keep reading for the solution.