This perplexing numerical brain teaser requires a sharp mind to beat the clock and solve it.

If you consider yourself above average in intelligence, with keen observational and mathematical skills, you might stand a good chance at cracking this challenging puzzle. Not only is it an excellent way to keep yourself and the kids occupied this week, but it’s also a proven method for exercising your brain.

Optical illusions and brain teasers are known to enhance focus and concentration skills. This…