Introduction
Ratios and Proportions is one of important topic in Quantitative Aptitude Section. In Ratios and Proportions – Quiz 7 article candidates can find questions with an answer. By solving this questions candidates can improve and maintain, speed, and accuracy in the exams. Ratios and Proportions – Quiz 7 questions are very useful for different exams such as IBPS PO, Clerk, SSC CGL, SBI PO, NIACL Assistant, NICL AO, IBPS SO, RRB, Railways, Civil Services etc.
Q1
If a:b = 3:4, b:c = 7:9, c:d = 5:7, find a:d?
- A. 5:12
B. 7:12
C. 3:11
D. 5:11
[latex]\frac {a}{d} = \frac {3}{4} \times \frac {7}{9} \times \frac {5}{7} \rightarrow \frac {5}{12}[/latex]
Q2
The proportion of copper and zinc in the brass is 13:7. How much zinc will there be in 100 kg of brass?
- A. 20 kg
B. 35 kg
C. 55 kg
D. 14 kg
[latex]\frac {7}{20} \times 100 = 35[/latex]
Q3
The ratio of two numbers is 2:3 and the sum of their cubes is 945. The difference of number is?
- A. 3
B. 4
C. 5
D. 6
2x, 3x
8x cube + 27x cube = 945
35x cube = 945
x cube = 27 [latex] \rightarrow [/latex] x = 3
Q4
The ratio of the number of ladies to gents at a party was 1:2 but when 2 ladies and 2 gents left, the ratio became 1:3. How many people were at the party originally?
- A. 36
B. 24
C. 12
D. 6
x, 2x
(x-2):(2x-2) = 1:3
3x - 6 = 2x-2
x = 4
x + 2x = 3x
[latex] \rightarrow [/latex] 3 [latex] \times [/latex] 4 = 12
Q5
The first three terms of a proportion are 3, 9 and 12. The fourth term is?
- A. 4
B. 6
C. 18
D. 36
[latex]\frac {9 \times 12}{3} = 36[/latex]