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anonymous
 5 years ago
The sum of three numbers is 12. The first number is twice the sum of the second and third. The third number is 5 less than the first. Find the number.
The key is: first is 8, second is 1, third is 3
This is complicated if you have to show your work and not just guess and check. Set up the equations first.
anonymous
 5 years ago
The sum of three numbers is 12. The first number is twice the sum of the second and third. The third number is 5 less than the first. Find the number. The key is: first is 8, second is 1, third is 3 This is complicated if you have to show your work and not just guess and check. Set up the equations first.

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0There aren't really equations. You just have to use logic. Use that Logic, process of elimination.. I'm not sure what level of math you are in though

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0if you set up equation I know how to solve

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0You could maybe use probability. Are you learning about Cnr and Pnr?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I can solve you don't have to solve , you just help me set up equation

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0umm okay i'm not sure if this is right but

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0figure out how many sums of 3 DIFFERENT (whole) numbers add up to 12. so 12*11*10

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so thats your total possibilities and now u can narrow it down

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[\{a+b+c=12,a=10+2 a+2 b,c=a5\} \]\[\{\{a\to 8,b\to 1,c\to 3\}\} \]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0robtobey how yu get number 10 and 5 ,

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0the key for check answer not the given

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I'm working on a response.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I still don't get ,how you get 10?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0{a + b + c = 12, a = 2 (b + c) , c = a  5} Replace c in the first two equations with (a5) {5 + 2 a + b = 12, a = 2 (5 + a + b)} Expand the second equation above by multiplying through by 2 {5 + 2 a + b == 12, a == 10 + 2 a + 2 b} Solve the above two equations for a and b Take the value of a and plug it into c = a  5 to obtain the value of c I hope I got this correct.
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