# Calculate the number 399

NUMBERMANIA: Calculate the number 399 using numbers [4, 2, 7, 4, 22, 670] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.Correct answers:

**2**#brainteasers #math #numbermania

### Cork Screw

Gary and Martin were standing at the urinals in a public lavatory, when Gary glanced over and noticed that Martin's penis was twisted like a corkscrew. "Wow," Gary said. "I've never seen one like that before."

"Like what?" Martin said.

"All twisted like a pig's tail," Gary said.

"Well, what's yours like?" Martin said.

"Straight, like normal," Gary said.

"I thought mine was normal until I saw yours," Martin said.

Gary finished what he was doing and started to give his old boy a shakedown prior to putting it back in his pants. "What did you do that for?" Martin said.

"Shaking off the excess drops," Gary said. "Like normal."

"&%$#@ !," Martin said. "And all these years I've been wringing it."