Subject: General Aptitude · Chapter: Ratio and Proportion · Exam: · Marks: · Difficulty:
A jar contains black and white marbles. If there are ten marbles in the jar, then which of the following could not be the ratio of black to white marbles?
(a)1 : 4
(b)1 : 10
(c)7 : 3
(d)9 : 1
Answer
Answer (as printed): B
Explanation
Since the number of black and white marbles are whole numbers, so the sum of the terms of the ratio must be a factor of 10. $1+4=5,7+3=10$ and $9+1=10$, but $1+10=11$, which is not a factor of 10.
Explanation as extracted from the printed page; notation may be imperfect.