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Math brain teasers require computations to solve.


Puzzle ID:#48954
Fun:*** (2.26)
Difficulty:*** (2.73)
Submitted By:Mathgeek007Aca****!
Corrected By:ThinksForFun




There was a body pump class that lasted a long time, but it always changed. The instructor was a very smart person and liked to throw puzzles at the students. About 15 minutes into the class, one kid asked how much time there was left in the class. He said: "Right now? Oh, I'd say seven." The kid was confused and knew the instructor was never going to tell anybody.

Another 5 minutes in, another kid asked how much time was left. The instructor said, "About five now." Confused, the kid went back and the class continued.

Ten minutes later, a perplexed pupil in the front asked how much time was left. The instructor said, "I think it's about three."

Suddenly, the pupil clicked into what the puzzle was and how much time there was left of the class and how long the class was.

How much time was left of the class?

Open Calculator


90 minutes.

When the first student asked, 15 minutes in, the instructor said "Seven". 15 times 7 is 105, the amount of time left in the class.

The second student asked 5 minutes later (20 minutes in) and the instructor said "Five." 20 times 5 is 100, the number of minutes left in the class.

The last student got "Three" when he asked again, at the 30 minute mark. 30 times 3 is 90, the number of minutes left in the class and the answer to this brain teaser.

The class was two hours long.


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