The ratio of the present ages of a man and his wife
is 5: 4. Which of the following can't be a possible
ratio of their ages 20 years ago?
(A) 7:5
(B) 3:2
(C) 13:10
(D) 6:5
Answers
Answer:
7 If at the time of marriage the ratio was 5 : 3 then how many years ago were they married?
Answer:
option is D
Step-by-step explanation:
In our case we have the ratio 5:4, and we are subtracting a constant from both sides. That means the new ratio must be further from 1 than the original ratio. In other words, since the original ratio is greater than 1, the new ratio must be greater than the the original (5:4). So for an answer choice to be impossible, it will have to be less than the original ratio (closer to 1). So now we can check our answer choices and see which is the odd one out.
5:4 = 25:20
A) 7: 5 = 28:20 -->ok
B) 3: 2 = 30:20 --> ok
C) 13:10 = 26:20 --> ok
D) 6: 5 = 24:20 --> NO
E) 6: 4 = 30:20 --> ok
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