exam Maths Puzzle Numerical Ability

Identify the ordered pair(s) so that it (they) is (are) not a solution(s) for 7x + 2y = 17:
(0, 2/17)
(1, 17/7)
(0.5, 27/4)
(-2, 31/2)

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A migrating elephant herd started moving at a rate of 6 miles per hour. One elephant stood still and was left behind. Then this stray elephant sensed dang Given three successive 1:100 dilutions (into bottles A, B, C) from a culture sample cotaining 120,000,000 organisms pere milliliter, calculate the number of organisms per millilite