46. 51.3 + 7.078 +1.38 + 0.9 = ?

1. 1. 61.668

   
   
   

   2. 59.238

   
   
   

   3. 60.658

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   51.300 + 7.078 + 1.380 + 0.900

   Correct Option: C

   51.300 + 7.078 + 1.380 + 0.900 = 60.658

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47. 3 x 0.3 x 0.03 x 0.003 x 30=?

1. 1. .0000243

   
   
   

   2. .000243

   
   
   

   3. .00243

   
   
   

   4. .0243

   
   
   

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1. View Hint View Answer Discuss in Forum

   3 x 3 x 3 x 3 x 30 = 2430

   Correct Option: C

   3 x 3 x 3 x 3 x 30 = 2430
   ∴ 3 x 0.3 x 0.03 x 0.003 x 30 = 0.002430 (Six places of decimal )

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48. 16.7 + 12.38 - ? =10.09

1. 1. 17.89

   
   
   

   2. 18.99

   
   
   

   3. 16.98

   
   
   

   4. 20.09

   
   
   

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1. View Hint View Answer Discuss in Forum

   Let 16.7 + 12.38 - x =10.09
   ∴ x = 16.7 + 12.38 - 10.09

   Correct Option: B

   Let 16.7 + 12.38 - x =10.09
   ∴ x = 16.7 + 12.38 - 10.09
   = 18.99

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49. 0.6 + 0.66 + 0.066 + 6.606 = ?

1. 1. 6.744

   
   
   

   2. 6.738

   
   
   

   3. 7.932

   
   
   

   4. 7.388

   
   
   

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1. View Hint View Answer Discuss in Forum

   0.6 + 0.66 + 0.066 + 6.606 = 0.600 + 0.660 + 0.066 + 6.660

   Correct Option: C

   0.6 + 0.66 + 0.066 + 6.606 = 0.600 + 0.660 + 0.066 + 6.660
   = 7.932

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50. What decimal of an hour is a second ?

1. 1. .0025

   
   
   

   2. .0256

   
   
   

   3. .00027

   
   
   

   4. .000126

   
   
   

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1. View Hint View Answer Discuss in Forum

   Required decimal = 1/ ( 60 x 60)

   Correct Option: C

   Required decimal = 1/ ( 60 x 60)
   = .00027

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