exam Maths Puzzle Numerical Ability

The sum of two numbers is 34. Their difference is 10. What are the two numbers?

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exam Other Question

what is the "concept of slope"? Find K if the given system of equations has infinite no of solutions.
2x+ky=1+2y and kx+12y=3
(1)-4 (2)6 (3)Either (1) or (2) (4) none of these.

i have chosen (3). But theanswer givenis (2). How it could be..?? plz explain this...??