Brain Teasers
Three Consecutive Evens
Which three consecutive even numbers, when multiplied together, give the product 8xxxx2?
Each x here represents a digit, not necessarily the same.
Each x here represents a digit, not necessarily the same.
Answer
94, 96 and 98.It's easy to get: since 90^3=729000, they must all begin with 9. Because the last digit of 2*4*6 is 8, and the last digit of 4*6*8 is 2, it must be 94*96*98, which equals 884352.
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Comments
Sorry not to good with math, GREAT TEASER THOUGH
Easy - but not with the Braingle calculator, you need to be able to get a cube root.
I just kept checking different numbers 'til i found it, but i guess i have too much time on my hands
Good one. Had to think about it but not too hard. Thanks!
Yeah I agree with Wizofaus
I'm lazy so I don't like to manually multiply 90^3 like (90*90*90)
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