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

This question belongs to Arithmetic Ability Algebra
Algebra
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If 999x + 888y = 1332 and 888x + 999y = 555, then the value of x + y is?

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