Questions on Algebra: Proportions answered by real tutors!

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Question 140093: Which pair of ratios does not form a proportion?
A. 4/10, 18/45
B. 26/2,52/4
C.-2/5, -8/25
D. -4/7, -20/35
Answ. -4/7, -20/35 Right????: Which pair of ratios does not form a proportion?
A. 4/10, 18/45
B. 26/2,52/4
C.-2/5, -8/25
D. -4/7, -20/35
Answ. -4/7, -20/35 Right????
Answer by checkley77(3639) About Me  (Show Source):
You can put this solution on YOUR website!
answer d) is incorrect. (-4/7)*5=-20/35
answer c) is not an appropriate ratio: (-2/5)*4=-8/20