On Hustlers and Burglars

Mr. Fagin introduced his gang of burglars, pickpockets and street hustlers to Oliver twist.
We have here 15 burglars, 12 pickpockets and 13 street hustlers, 5 of them are also burglars and pickpockets, 6 are also burglars and street hustlers and 4 are also pickpockets and street hustlers. Tom and Dee are my deputies they are professionals, they can do all three jobs.
Now Oliver smart kid, how many kids I am leading with out you?

Oliver Twist - By Charles Dickens read online for free - LINK

Pickpockets

Answer:

Sub Total = (15+12+13)=40, now we will subtract the kids with the two "skills" (5+6+4)=15, but now we will add the two deputies which are multi skilled.

Total=40-15+2=27 kids in Mr. Fagin's Gang now Oliver Twist became No 28.

Magic Squares and Mathmagic!!

Dürer's Magic Square  
Today I will bring you some interest calculations, because in our modern world we might lose our basic Math skills. So lets reinforce our rusty cells and have fun. 
Magic Square were investigated by many people during the history, but Albrecht Dürer
was also a painter, he combined his famous magic square in the paint Melencolia I,  
View some of his artwork too.

Albrecht Durer Drawings

Arthur Benjamin: Lightning calculation and other "Mathemagic"                                

Great show, learn some math tricks, you can look now for more tricks, exercise your brain, stop relying on the gadgets, or we all rust. 

Math is so easy