Ratio and Proportion Formulas for Competitive Exams
The ratio between the ages of a father and his son four year ago was 19:6. If the difference between the ages of the father and son is 26 years, what will be the ratio of their present ages?
(A) 21 : 8
(B) 23 : 8
(C) 23 :10
(D) 27 : 14
Correct Answer : A
The number of students in three classes are in the ratio 2:3:5. If the number of students in each class is increased by 20 the ratio become 4: 5: 7. The total number of students before the increase was
(A) 80
(B) 90
(C) 100
(D) 120
Correct Answer : C
If a : b = 20:5 then find out the value of (13a-9b): (11a-7b)?
(A) $$ {43\over 37}$$
(B) $$ {43\over 42}$$
(C) $$ {44\over 37}$$
(D) $$ {40\over 33}$$
Correct Answer : A
What must be added to two numbers that are in the ratio of 3:4, so that they become in the ratio 4:5?
(A) 0.5
(B) 1
(C) 2
(D) 4
Correct Answer : B
Rs. 425 is divided among 4 men, 5 women and 6 boys such that the share of a man , a woman and a boy may be ratio of 9:8:4. What is the share of a woman?
(A) Rs. 24
(B) Rs. 28
(C) Rs. 32
(D) Rs. 34
Correct Answer : D
I hope these formulas are helpful for you. If you have any doubt or you want to ask anything regarding ratio and proportion formulas, you can ask me in the comment section.
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Vikram Singh
Providing knowledgable questions of Reasoning and Aptitude for the competitive exams.
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