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If x, y, and z are positive integers such that 0 < x < y < z and x is

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If x, y, and z are positive integers such that 0 < x < y < z and x is  [#permalink]

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New post 13 Mar 2018, 00:06
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Question Stats:

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If x, y, and z are positive integers such that 0 < x < y < z and x is even, y is odd, and z is prime, which of the following is a possible value of x + y + z?

A. 4
B. 5
C. 11
D. 15
E. 18

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Re: If x, y, and z are positive integers such that 0 < x < y < z and x is  [#permalink]

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New post 13 Mar 2018, 00:28
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Bunuel wrote:
If x, y, and z are positive integers such that 0 < x < y < z and x is even, y is odd, and z is prime, which of the following is a possible value of x + y + z?

A. 4
B. 5
C. 11
D. 15
E. 18


As we're given mostly number-property related information (even, odd, prime) we'll look for a theoretical answer.
This is a Logical approach.

Since a prime number is always odd, then x + y + z is even + odd + odd = even.
(B), (C), (D) are eliminated.
(A) 4 is too small as it can't be the sum of 3 positive integers.

(E) must be our answer.
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If x, y, and z are positive integers such that 0 < x < y < z and x is  [#permalink]

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New post 13 Mar 2018, 08:45
Bunuel wrote:
If x, y, and z are positive integers such that 0 < x < y < z and x is even, y is odd, and z is prime, which of the following is a possible value of x + y + z?

A. 4
B. 5
C. 11
D. 15
E. 18

I agree with DavidTutorexamPAL that number property theory is very efficient.

We have
0 < x=even < y=odd < z=ODD prime
z must be odd.
All primes after 2 are odd.
If z = 2, y must = 1, and there is no value left for x because (x > 0)

x + y + z =
(E + O\(_1\)) + O\(_2\) =
(O\(_3\) ) + (O\(_2\) ) = E

That said, a few real number trials will establish a pattern. x can be no smaller than 2

2 + 3 + 5 = 10
4 + 5 + 7 = 16
6 + 7 + 11 = 24
8 + 9 + 11 = 26
All are even, and all are > 4

This method is not foolproof for some variable questions (here, number property restrictions do make it foolproof). But if you're stuck, it gives you a basis from which to work.

Answer E
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If x, y, and z are positive integers such that 0 < x < y < z and x is  [#permalink]

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New post 19 Mar 2018, 10:23
1

SOLUTION


We know:

    • x is an even number greater than 0.
      o Thus x>=2.

    • y is an odd number.
    • Since z is a prime number greater than x, thus z is an odd number.

Now, we know the nature of x, y, and z, we can easily find the nature of (x + y+ z).

    • x + y + z= Even + odd + odd
    • x + y + z = Even + Even
    • x + y + z = Even
The two even number in the given options are 4 and 18.

The minimum value of x and z are 2 and 3 respectively. And the sum of the minimum values of x and z, that is 2 and 3, is already greater than 4.
Hence, the value of x +y + z cannot be 4.

Therefore, the possible value of (x + y + z) is 18.

Answer: E
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Re: If x, y, and z are positive integers such that 0 < x < y < z and x is  [#permalink]

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New post 23 Mar 2018, 10:18
Bunuel wrote:
If x, y, and z are positive integers such that 0 < x < y < z and x is even, y is odd, and z is prime, which of the following is a possible value of x + y + z?

A. 4
B. 5
C. 11
D. 15
E. 18


Here logic wins;

Given : 0 < x < y < z and x is even, y is odd, and z is prime

x = even, that means we don't require digit "1" here.

Start with "2" as "x" is even, then next two numbers (y and z) are greater than "2".

This means the sum of x + y + z will always be greater than "9".

Consider 2 + 3 + 4 (without restriction in a sequence), so A and B are out.

Now with given considerations in the question:

x = even, y = odd, and z = prime (this prime will always be odd as we have consumed the only even prime number "2" as "x".

Therefore, even + odd + odd = even.

Our answer should be even so C and D are also out.

(E)
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Re: If x, y, and z are positive integers such that 0 < x < y < z and x is  [#permalink]

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New post 05 Apr 2018, 10:11
Bunuel wrote:
If x, y, and z are positive integers such that 0 < x < y < z and x is even, y is odd, and z is prime, which of the following is a possible value of x + y + z?

A. 4
B. 5
C. 11
D. 15
E. 18


If x is even, y is odd, and z is prime, then the values could be:

x = 2

y = 3

z = 13

So x + y + z = 18.

Answer: E
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Re: If x, y, and z are positive integers such that 0 < x < y < z and x is &nbs [#permalink] 05 Apr 2018, 10:11
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