Asked by Bea

Which pair of ratios does not form a true proportion?
A) 8:14 and 20:35
B) 6 to10 and 15 to 25
C) 9 5 = 27 15
D) 12:15 and 30:50
Answered by oobleck
if a/b = c/d the ad = bc
so, check the choices.
Does 14*20 = 8*35? yes
Now find the one which fails the test
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