exam Maths Puzzle Numerical Ability

solve the following equations....
4ax + by = 11ab
8ax - 5by = ab
thank you!!!

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exam Other Question

I need some help with this problem:

I have a table where the land are (1,000 mi (power of 2)
For Europe they show on the chart 3,800 for land are
The question is what is What is the proccess in solving this problem??