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If ax + ay + az = 15, what is x + y + z ? (1) x = 2 (2) a = 5

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If ax + ay + az = 15, what is x + y + z ? (1) x = 2 (2) a = 5  [#permalink]

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New post 03 Feb 2019, 10:04
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If ax + ay + az = 15, what is x + y + z ?

(1) x = 2

(2) a = 5

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Re: If ax + ay + az = 15, what is x + y + z ? (1) x = 2 (2) a = 5  [#permalink]

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New post 03 Feb 2019, 10:25
1
SajjadAhmad wrote:
If ax + ay + az = 15, what is x + y + z ?

(1) x = 2

(2) a = 5



we are looking for the value of x + y + z.

Given,

ax + ay + az = 15

a( x + y + z) = 15.

Statement 1: x=2. we don't know the value of a, y and z. NOT sufficient.

Statement 2: a=5.

a(x + y + z) = 15

5 ( x + y + z) = 15

x + y + z = 3.

Sufficient.

B is the correct answer.
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Re: If ax + ay + az = 15, what is x + y + z ? (1) x = 2 (2) a = 5  [#permalink]

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New post 03 Feb 2019, 10:32
SajjadAhmad wrote:
If ax + ay + az = 15, what is x + y + z ?

(1) x = 2

(2) a = 5


IMO B

a(x+y+z) = 15

x+y+z = 15/a

1) x =2
Doesn't tell anything

2) when put back in the question gives value x + y + z as 3
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Re: If ax + ay + az = 15, what is x + y + z ? (1) x = 2 (2) a = 5  [#permalink]

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New post 04 Feb 2019, 02:09
1
SajjadAhmad wrote:
If ax + ay + az = 15, what is x + y + z ?

(1) x = 2

(2) a = 5



xa + ay + az = 15
a(x+y+x)=15

#1
x=2
not sufficient as values of y,z,a are not know
#2
a=5
so x+y+x= 3
sufficient
IMO B
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Re: If ax + ay + az = 15, what is x + y + z ? (1) x = 2 (2) a = 5   [#permalink] 04 Feb 2019, 02:09
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