math brain teaser.... are you brain enough?

[ChefWide]

using the numbers:

21 ,19, 8, 10 and 6

add them, subtract them, square them, square root, cube, cube root, mulitply, divide.... you name it... but the answer MUST be '9' and you must use all the numbers every time... 5k in k to the one with the most correct variations.

 

[hanselthecaretaker]

(21+19)/8=5 +10=15 -6= "9"

 

[ChefWide]

(21+19)/8=5 +10=15 -6= "9"

lead dog. and yes, The Black Keys RULE.

 

[hanselthecaretaker]

lead dog. and yes, The Black Keys RULE.

I've only heard that one song off a promotional cd; I'm gonna check out their album though since I've read they have a lot of meaty blues type guitar on it. Good stuff.

 

[1_more_rep]

1. (21+19)/8=5 +10=15 -6= 9

2. 21-19 = 2(10-6)=8 + 8^0 = 9


i win with 2 !

 

[jackangel]

went down to tin pan alley

see what was going on

things was too hot down there

couldn't stay very long

heyyyyyyyyyyyyyyyyyyyyyyyy

alley's the roughest place...i've ever...beeeeeeeeeeeen

 

[hamstershaver]

(21+19)/8=5 +10=15 -6= "9"

not taking anything away from hansel but how is this answer correct when hes adding 2 numbers in the equation that you didnt have listed
5 and 15

 

[UA_Iron]

1. (21+19)/8=5 +10=15 -6= 9

2. 21-19 = 2(10-6)=8 + 8^0 = 9


i win with 2 !

the exponent of zero was not in the problem either....

21 ,19, 8, 10 and 6

6! = 720; 720/8 = 90; 90/10 = 9; 9 + 21 = 30; 30/10 = 3; 3+6 = 9; 9 + 21 = 30; 30 - 19 = 11; 11 - 10 = 1; 1 + 8 = 9

condensed: [(6!/8)*(1/10) + 21](1/10) + 6 + 21 - 19 - 10 + 8 = 9


10^6/(21+19) = 25000; 25000/10 = 2500; 2500 - (10*10*21) = 400; 400/8 = 50; 50-10 = 40; 40 - 21 = 19; 19 - 10 = 9

condensed: [(10^6)/(21+19) * (1/10)] - (10*10*21)*(1/8) - 10 - 21 - 19 = 9

there are infinite combinations fyi....

 

[Beachbum1546]

not taking anything away from hansel but how is this answer correct when hes adding 2 numbers in the equation that you didnt have listed
5 and 15

those are just the equalled amounts. they are not computated in the problem.

 

[hamstershaver]

those are just the equalled amounts. they are not computated in the problem.

yes they are computed in his equation