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In a class of 450 boys and 550 girls, 32% of the boys and 38% of the girls passed the exam. How many students failed the exam?
  1. 653
  2. 647
  3. 645
  4. 640
Explanation
  1. Number of boys who passed:

32% of 450=32100×450=144

A number of boys who failed:

450−144=306

  1. Several girls who passed:

38% of 550=38100×550=209

A number of girls who failed:

550−209=341550 - 209 = 341

  1. Total students who failed:

306 (boys) +341 (girls) =647306 text{ (boys) } + 341 text{ (girls) } = 647

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