Maths - Ratio Proportion Questions Answers

1. A box contains a dozen bulbs in which few are defective and remaining are good. Which of the following cannot be a ratio of defective bulbs to good bulbs?

5951
• A. 1 : 1  • B. 1 : 2  • C. 1 : 3  • D. 1 : 4  • Option : D
• Explanation : (D) If the ratio is 1 : 4, Then the number of defective bulbs = x and number of good bulbs = 4x
∴ x + 4x = 12
⇒ 5x = 12
which is not possible for any integral value of x.
So, 1 : 4 is not possible.

2. If(3a + 5b) : (3a - 5b) = 5 : 1, then the value of a : b will be

5992
• A. 3 : 2  • B. 5 : 3  • C. 2 : 1  • D. 5 : 2  • Option : D
• Explanation : (D) 3. The production of company X is 120% of the production of company Y and 80% of the production of company Z. The respective ratio between the production of companies X, Y and Z is

5995
• A. 4 : 3 : 5  • B. 6 : 5 : 9  • C. 10 : 9 :12  • D. 12 : 10 : 15  • Option : D
• Explanation : (D) Let the production of Y =100
Then, production of X =120
Production of Z =150
Required ratio of X, Y and X
=X : Y : Z
=120 : 100 : 150
=12 : 10 : 15

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Maths - Ratio Proportion MCQ Questions

• Algebra
• Number System