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1. After taking 30 socks out of the washing machine, Shamim noticed that the ratio of blue socks to brown socks to black shoks was 2 : 3 : 5. How many black socks were in the washing machine?

  • A. 21
  • B. 21
  • C. 21
  • D. 21

Answer: Option B

Explanation:

Blue, brown এবং black মোজার আনুপাতিক মানের যোগফল (2 + 3 + 5) = 10
so black মোজার সংখ্যা = 30×5/10= 15 টি

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