shipra2205 wrote:
Can you explain why one answer works and the other doesnt ? You kind of lost me there in the end.
shwetakoshija wrote:
a:b = 3:7
Let a = 3k and b= 7k.
Then, b-a = 4k.
Hence, our answer should be a multiple of 4. We can clearly eliminate statement I.
Now, we will check II and III to make sure both numbers are less than 50.
II. If 24 = 4k, then k=6.
Hence, a=3k=18 and b=7k=42. WORKS
III. If 36 = 4k, then k=9.
Then, a=3k=27 but b=7k=63. FAILS
ANSWER: (B)
Let a = 3k and b= 7k.
Then, b-a = 4k.
Hence, our answer should be a multiple of 4. We can clearly eliminate statement I.
Now, we will check II and III to make sure both numbers are less than 50.
II. If 24 = 4k, then k=6.
Hence, a=3k=18 and b=7k=42. WORKS
III. If 36 = 4k, then k=9.
Then, a=3k=27 but b=7k=63. FAILS
ANSWER: (B)
a and b are required to be less than 50, but in option III, b turns out be 63, which is > 50.
Statistics : Posted by chetan2u • on 25 Dec 2019, 23:00 • Replies 4 • Views 1435
