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If 2x + y = 15 , 2y + z = 25 and 2z + x = 26, what is the value of z ?
A) 4
B) 7
C) 9
D) None of these
Correct answer:
D) None of these
Description for Correct answer:
According to question,
\( \Large y = \frac{25 - z}{2} \)
x = 26 - 2z
\( \Large \therefore 2 (26 - 2z) + \frac{25 - z}{2} = 15 \)
\( \Large 52 - 4z + \frac{25 - z}{2} = 15 \)
104 - 8z + 25 - z = 30
- 9z = 30 - 129
- 9z = - 99
\( \Large \therefore z = 11 \)
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