ratio and proportion mcq pdf Model Questions & Answers, Practice Test for ibps rrb so officer sclae 2 3 single exam 2024
ibps rrb so officer sclae 2 3 single exam 2024 SYLLABUS WISE SUBJECTS MCQs
Number System
Lcm & Hcf
Ratio & Proportion
Percentage
Time & Work
Mensuration
Advance Math
Trigonometric Ratios & Identities
In a class of 49 students, the ratio of girls to boys is 4 : 3. If 4 girls leave the class, the ratio of girls to boys would be
Answer: (a)
No. of boys = $3/7$ × 49 = 21
No. of girls = $4/7$ × 49 = 28
ATQ
${28 - 4}/{21} = {24}/{21} = 8/7$
Three partners altogether invested Rs 1,14,000 in a business. At the end of the year, one got Rs 337.50, the second got Rs 1,125.00 and the third, Rs 675 as profit. What is the percentage of profit ?
Answer: (b)
Total profit = 337.50 + 1125.00 + 675
= Rs 2137.50
Percentage profit = ${2137.50}/{114000}$ × 100 = 1.8%
Age of X is six times that of Y. After 4 years, X is four times elder to Y. What is the present age of Y ?
Answer: (b)
Let the age of X and Y are x years and y years respectively.
Then, (x + 4) = 4(y + 4)
⇒6y + 4 = 4y + 16
⇒2y = 12
∴ y = 6
∴ The present age of y = 6 years
Given y is inversely proportional to $√x$ , and x = 36 when y = 36. What is the value of x when y = 54?
Answer: (b)
y = $k/{√x}$
36 = $k/{√{36}} = k/6$⇒k = 36 × 6 = 216
Now $√x = {216}/{54}$ = 4 ⇒ x = 16
The ratio between the boys and girls in a class is 6 : 5. If 8 more boys join the class and two girls leave the class then the ratio becomes 11 : 7. What is the number of boys in the class now?
Answer: (b)
Let the original number of boys and girls be 6x and 5x respectively.
Then, ${6x+8}/{5x-2}=11/7$
⇒ 55x-42x=56+22
⇒ x=$78/13=6$
∴Number of boys
= 6 × 6 + 8 = 44
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