Here is an ancient problem from Bhaskaracharya's Lilavati: Beautiful maiden, with beaming eyes, tell me which is the number that, multiplied by three, then increased by three-fourths of the product, divided by seven, diminished by one-third of the quotient, multiplied by itself, diminished by 52, the square root found, addition of eight, division by ten gives the number two? Well, it sounds complicated, doesn't it? No, not if you know how to go about it.