Ratio and Proportion Aptitude (MCQ) questions and answers

21.  If a : b : c = 3 : 4 : 7, then the ratio (a + b + c) : c is equal to:

• 1:2
• 2:1
• 3:4
• 5:6

Answer - [ 2:1 ]

22. The number of students in 3 classes is in the ratio 2 : 3 : 4. If 12 students are increased in each class this ratio changes to 8 : 11 : 14. The total number of students in the three classes in the beginning was:

• 160
• 134
• 162
• 120

Answer - [ 162 ]

23. A box has 210 coins of denominations one-rupee and fifty paise only. The ratio of their respective values is 13 : 11. The number of one-rupee coin is :

• 34
• 23
• 78
• 70

Answer - [ 78 ]

24. If A and B are in the ratio 3 : 4, and B and C in the ratio 12 : 13, then A and C will be in the ratio:

• 5:4
• 9:13
• 1:2
• 2:1

Answer- [ 9:13 ]

25. The salaries of A, B and C are in the ratio 1 : 3 : 4. If the salaries are increased by 5%, 10% and 15% respectively, then the increased salaries will be in the ratio: 21:66:92 21:66:93 21:66:91 21:66:90 Answer - [ 21:66:93 ] 26.   If A : B = 2 : 3 and B : C = 4 : 5 then A : B : C is: 4:3:5 8:12:15 2:23:12 1:2:3 Anwer - [ 8:12:15 ]

27. If two times A is equal to three times of B and also equal to four times of C, then A : B : C is:

• 4:5:4
• 6:4:3
• 6:5:3
• 1:2:9

Answer - [ 6:4:3 ]

28. In a school having roll strength 286, the ratio of boys and girls is 8 : 5. If 22 more girls get admitted into the school, the ratio of boys and girls becomes

• 4:3
• 5:6
• 4:2
• 1:2

Answer - [ 4:3 ]

29.  Two numbers are in ratio 4 : 5 and their LCM is 180. The smaller number is: 34 36 12 11 Answer - [ 36 ] 30.  In a class, the number of girls is 20% more than that of the boys. The strength of the class is 66. If 4 more girls are admitted to the class, the ratio of the number of boys to that of the girls is: 4:3 4:5 3:4 3:6 Answer - [ 3:4 ]