MCQ practice · SSC General Mathematics Board questions · Chapter 11: Algebraic Ratio and Proportion
If 3 : 8 :: z : 32, what is the value of z?
Think it through first, then pick an option.
- a 0.75
- b 3
- c 12
- d 85.33
Answer and explanation
Correct answer: c 12
8z = 3 × 32 = 96, so z = 12.
Why the other options are wrong
- a 0.75: 0.75 is a wrong value; z = 3 × 32/8 = 12.
- b 3: 3 is just the first term; z comes from cross-multiplying.
- d 85.33: This is 8 × 32/3; the multiplication and division were taken the wrong way.
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