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ഒരു ക്ലാസിലെ 35 കുട്ടികളുടെ ശരാശരി വയസ് 11 ആണ്. ടീച്ചറേയും കൂടി ചേർത്തപ്പോൾ ശരാശരി വയസ് 12 ആയി. ടീച്ചറുടെ വയസ് എത്ര ?

A40

B37

C47

D42

Answer:

C. 47

Read Explanation:

  • 35 കുട്ടികളുടെ ശരാശരി വയസ് = 11

  • S35 / 35 = 11

  • S35 = 11 x 35 = 385

  • S35 = 385

  • ടീച്ചറേയും കൂടി ചേർത്തപ്പോൾ ശരാശരി വയസ് = 12

  • (S35 + T) / 36 = 12

  • (S35 + T) = 12 x 36

  • (S35 + T) = 432

  • (S35 + T) = 432

  • 385 + T = 432

  • T = 432 - 385

  • T = 47


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