If 999x + 888y = 1332 and 888x + 999y =...

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If 999x + 888y = 1332 and 888x + 999y = 555, then the value of x + y is?

A. 888

B. 1

C. 555

D. 999

Answer: Option B

Solution(By Examveda Team)

$$\eqalign{ & 999x + 888y = 1332 \cr & \underline {888x + 999y = 555} \cr & 1887\left( {x + y} \right) = 1887 \cr & \Rightarrow x + y = \frac{{1887}}{{1887}} \cr & \Rightarrow x + y = 1 \cr} $$

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