Mathematical Reasoning

JKSSB Junior Assistant · Reasoning · 8 practice questions with answers and explanations: 3 Easy, 3 Medium, 2 Hard.

Sample questions

Sample Easy question 1

If all Roses are Flowers, and all Flowers need Water, which of these must be true?

  1. All Roses need Water
  2. All Flowers are Roses
  3. No Rose needs Water
  4. Only Roses need Water
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Answer: A. Since Roses are a subset of Flowers, and all Flowers need Water, it logically follows that all Roses need Water.

Sample Medium question 2

If all Pens are Pencils, and some Pencils are Erasers, which conclusion is definitely valid?

  1. All Pens are Erasers
  2. Some Pens are Erasers
  3. No valid conclusion about Pens and Erasers can be drawn
  4. All Erasers are Pens
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Answer: C. Since only 'some' Pencils are Erasers, and we don't know if Pens fall into that overlapping subset, no definite conclusion links Pens and Erasers.

Sample Hard question 3

Three friends A, B, and C have ages such that A is twice as old as B, and B is 3 years older than C. If C is 12 years old, how old is A?

  1. 24
  2. 27
  3. 30
  4. 15
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Answer: C. C = 12, B = C + 3 = 15, A = 2 × B = 2 × 15 = 30.

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