Short difficult logic riddles for teens

47 + 53 + 59 + 61 = 220

There is no answer, it's a paradox. It cannot be made to work. Search: "Barber paradox"

A piano.

1 Already stated 1=5 => 5=1

The workers work at the mint and are tired of being overworked. They want to work less, which is making less money, since money is made at the mind!

Two. The inside and the outside.

N for November.

Counterfeit money.

February because it's the shortest month.

3 or 0.75 Explanation: Rewriting the last 2 equations in terms of Alonso, Fernando = 2/Alonso McLaren = 6/Alonso Replacing above values in equation "Fernando + Alonso + McLaren = 6" 2/Alonso + Alonso + 6/Alonso =6 (2 + Alonso^2 + 6)/Alonso = 6 8 + Alonso^2 = 6Alonso Alonso^2 - 6Alonso + 8 = 0 (Alonso - 4) (Alonso - 2) = 0 Therefore; Alonso = 4 or 2 Let's take value of Alonso as 2 Fernando = 2/2 = 1 McLaren = 6/2 = 3 Therefore; McLaren x Fernando = 3 x 1 = 3 Let's take value of Alonso as 4 Fernando = 2/4 = 0.5 McLaren = 6/4 = 1.5 Therefore; McLaren x Fernando = 1.5 x 0.5 = 0.75