Subject: General Aptitude · Chapter: Ratio and Proportion · Exam: · Marks: · Difficulty:
The ratio of the students in schools A, B and C is 5 : 4 : 7. If the number of students in the schools are 214. A wheel that has 6 cogs is meshed with a larger increased by 20%, 25% and 20% respectively, what wheel of 14 cogs. When the smaller wheel has made would be the new ratio of the students in schools 21 revolutions, the number of revolutions made by A, B and C? (Bank P.O., 2010) the larger wheel will be
(a)4
(b)9
(c)12
(d)49
(e)None of these RATIO AND PROPORTION
Answer
Answer (as printed): B
Explanation
Let the number of students in schools A, B and C be 5x, 4x and 7x respectively. 6 New strength of school A = 120% of 5x = × 5 x = 6x. 5 5 New strength of school B = 125% of 4x = × 4 x = 5x. 4 New strength of school C = 120% of 7x 467 6 42 x = × 7 x = . 5 5 42 x \ New ratio = 6x : 5x : = 30 : 25 : 42. 5
Explanation as extracted from the printed page; notation may be imperfect.