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Brain teasers

Brain teasers. by Ethan H and Ben. What is a brain teaser?. A brain teaser is a challenging problem that does not always have an obvious answer. There are all sorts of teasers, including math, science, logical, and mixed. Adding Eight.

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Brain teasers

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  1. Brain teasers by Ethan H and Ben

  2. What is a brain teaser? • A brain teaser is a challenging problem that does not always have an obvious answer. There are all sorts of teasers, including math, science, logical, and mixed.

  3. Adding Eight How can you 8 eight’s to get to the number 1,000 (Only using addition)? ANSWER 888+88+8+8+8=1,000

  4. Tic Tac Toe • Arrange numbers 1-9 on a tic tac toe board so that all the rows, columns, and diagonals add up to 15. Use ALL the numbers ONCE. ANSWER 4 3 8 9 5 1 2 7 6

  5. Billy’s uncle’s car • After visiting his uncle, Billy drove his uncles car back home. Being the old beaten up car it was, it had a gas leak, and was stuck in 2nd gear. This meant that he could only drive at 30mph while getting 20 mpg. With there only being 10 gallons in the tank, losing ½ a gallon an hour, the car died just as he pulled in to his driveway. How far away is Billy's uncles house from his? ANSWER 150 miles. 30mph/20mpg= 1.5gph+0.5gph=2gph 10gallons/2gph=5hours of driving. (5h)30mph= 150 miles.

  6. Tortoise and the hare • Haretown and Tortoiseville are 55 miles apart. A hare travels at 9 miles per hour from Haretown to Tortoiseville, while a tortoise travels at 2 miles per hour from Tortoiseville to Haretown. • If both set out at the same time, how many miles will the hare have to travel before meeting the tortoise en route? • HINT: Make an equation like we have been in class ANSWER Note that : Distance = Speed × Time Let t be the time before the hare and the tortoise meet. In t hours, the hare will travel 9 t miles. In t hours, the tortoise will travel 2 t miles. 9 t + 2 t = 55 So, t = 55 ⁄ 11 = 5 hours. Thus, distance traveled by hare before meeting = 9 × 5 = 45 miles.

  7. 5 zero equation (BONUS) • How can you get a total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator? ANSWER (0!+0!+0!+0!+0!)! =(1+1+1+1+1)! =(4)! =5! is 5*4*3*2*1=120

  8. Hope you had fun, thank you! WWW.braingle.com/math Ethan H and Bens’s brains

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