exam Maths Puzzle Numerical Ability

The sum of the coordinates of the solution to the system
2x-y=7
3x-2y=11
is?

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exam Other Question

The current in a stream moves at a speed of 3mph. A boat travels 45 miles upstream and 45 miles downstream in a total time of 8 hours. What is the speed of the boat in still water?

Any help would be greatly appreciated on this! (3x+y)^5

Set up is
1 5 10 10 5 1