exam Maths Puzzle Numerical Ability

consider the sequence -1, 2 , -3 , 4 , -5 ,. . . . -299, 300 . what is the average of this sequence of 300 numbers ?

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exam Other Question

A man spends $1.60 for thirty stamps, getting some 5 cent stamps and some 4 cent stamps. How much of each kind does he buy? Write three quadratic equations, with a,b and c (coefficients of x^2,x and the constant) as;
1. Integars
2. Rational numbers
3. Irrational numbers