Difficulty: Medium
Average Score: 66%
Entry Exam
Ratio and Proportion: 3 : 10 :: 12 : X
Correct answer
B
Rationale
To solve this proportion, set up the equation: 3/10 = 12/X. Cross-multiply to get 3X = 120. Dividing both sides by 3 gives X = 40. Therefore, the correct answer is B. X equals 40 to maintain the proportional relationship. The ratio 3:10 is equivalent to the ratio 12:40, hence X equals 40.