exam Maths Puzzle Numerical Ability

find the point (x,y),that maximizes P subject to the following constraints P=3x+2y

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Q 37

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I am not sure the answer to this question.
The problem is...if (x+yi)/(1+i)=(7)/(7+y), where x and y are real, what is the value of x+y?

I got 202i+346
I am not sure if that Solve the problem. A cruise boat travels 48 miles downstream in 3 hours and returns upstream in 6 hours. Find the rate of the stream.