which odd numbers from 1 to 15 add up to 30?

Question

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1230

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which three odd numbers from 1 to 17 add up to 30? i.e - + - + - =30

use 1,3,5,7,9,11,13,15,17

Guest Jul 12, 2015

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Best Answer

$\\(2x+1)+(2y+1)+(2z+1)=30\\ 2x+2y+2z+3=30\\ 2(x+y+z)=27$

If x and y and z are all integers there can be no answer to this.

Put more simply, If you add two odd numbers you get an even one. then

if you add on another odd number the answer must be odd. So it cannot be 30

Melody Jul 12, 2015

Melody · Answer 1 · 2015-07-12T06:04:34

$\\(2x+1)+(2y+1)+(2z+1)=30\\ 2x+2y+2z+3=30\\ 2(x+y+z)=27$

If x and y and z are all integers there can be no answer to this.

Put more simply, If you add two odd numbers you get an even one. then

if you add on another odd number the answer must be odd. So it cannot be 30