Civil Services Prep

Prelims 2026 · CSAT / Quantitative Aptitude · Question 49

How many times does 5 appear in all two-digit positive integers?<br/>

  1. 18
  2. 19
  3. 20
  4. 21

Answer

19

In the tens place, 5 appears in 50 to 59 = 10 times. In the units place, it appears in 15, 25, 35, 45, 55, 65, 75, 85, 95 = 9 times. Total = 19.

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