exam Maths Puzzle Numerical Ability

Could you please solve this problem by addition method?

x+y=13
22x+36y=356

Thank you.

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exam Other Question

Evaluate C(12,10). The problem states to rationalize the denominator.

√(2- 4/z^2 + 2/z^4 )

I came up with ((z^2- 1)√2)/z^2

Does that make sense? Any help would be greatly apprec