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Of the three numbers, the sum of the first two is $45$; the sum of the second and third is $55$ and the sum of the third and thrice the first is $90$. The third number is :

  1. $20$
  2. $25$
  3. $30$
  4. $35$
in Quantitative Aptitude retagged by
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1 Answer

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$\text{Let the first number is x, the second number is y & the third number is z}$

$\text{According to  the question}$

$x+y=45   ...(1)$

$y+z=55    ...(2)$


from (1) & (2)


from (3) & (4):


from equation (1):


from equation (3):


So option $(C)$ is correct.
edited by
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