30 Sum-thing

+ + = 30 \large \square + \square + \square = 30 Is it possible to fill the 3 boxes above using the numbers below such that the equation holds true? { 1 , 3 , 5 , 7 , 9 , 11 , 13 , 15 } \large \{ 1, 3, 5, 7, 9, 11, 13, 15 \}

Yes, it is possible No, it is not possible

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5 solutions

Chew-Seong Cheong
Nov 29, 2016

The numbers given are all odd and the sum of three odd numbers is an odd number but 30 is even. Therefore, it in not possible \boxed{\text{it in not possible}} .

9 can be used 6 thus 6(9) +11+13=30

MOHD FARAZ - 4 years, 6 months ago

True...though as a puzzle..upside down 9..or decimal places using the commas...5,3+9,7+15=30 both solve it. Thinking outside the box.

bruce merritt - 4 years, 6 months ago
Prokash Shakkhar
Dec 10, 2016

The numbers given here are odd numbers.. Besides the term of the sum n = 3 n=3 is an odd term. But the result given finally is 30 30 ; an even number!.. It's totally impossible.. Because, n O n \in O ; Where O O is the set of odd numbers.. And The odd termth sum of odd numbers can never be an even number.. So, \color\red\boxed{Impossible}

Harsh Vardhan
Dec 6, 2016

Clearly Odd numbers are of the form 2k+1 So sum of three odd number Which can be taken as 2a+1 2b+1 2c+1 Is given as- 2(a+b+c) +3 = 2(a+b+c) +2+1 =2(m) +1 which is odd Hence it is not possible

3!+11+13=30 or 3!+9+15=30

Farooq Khan - 4 years, 6 months ago

Think over this solution

Farooq Khan - 4 years, 6 months ago
Isaac Wright
Dec 23, 2016
  • All odd numbers can be written in the form 2 n + 1 2n+1
  • The set of numbers we have been giving are also all odd. 30 is even, and can be written as 2 k 2k
  • The equation can then be put into the form ( 2 a + 1 ) + ( 2 b + 1 ) + ( 2 c + 1 ) = 2 k 2 ( a + b + c ) + 3 = 2 k \\ \\ (2a+1)+(2b+1)+(2c+1)=2k \\ 2(a+b+c)+3=2k
  • If we evaluate each term on the left seperately, we find that 2 ( a + b + c ) 2(a+b+c) is even and 3 3 is odd, making it impossible for the sum of the right side to be even.

And yes, I do realise that this explanation is unnecessarily long.

SIana Nuncheva
Dec 10, 2016

The sum of three odd numbers is odd number, but 30 is even number.

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