self Maths Puzzle

If x
=root5-1÷root5+1 and xy =1, then the value of x2 +y2-3xy is:

(A) 4

(B) 3


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self Other Question

If x=√5-1÷√5+1 and xy =1, then the value of x2 +y2-3xy is:

(A) 4

(B) 3


A discount of 20% on one article is the same as a discount of 25% on another article. The cost prices of two articles respectively can be (in Rs):

(A) 1000, 800

(B) 600, 800