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1. Chris received a mark of 50% on a recent test Chris answered 13 of the first 20 questions correctly. Chrisalso answered 25% of the remaining questions on the test correctly. If each question on the test wasworth one mark, how many questions in total were on the test?​

Answer»

Step-by-step explanation:

Given 1. Chris received a mark of 50% on a recent TEST Chris answered 13 of the first 20 questions correctly. Chris also answered 25% of the   REMAINING questions on the test correctly. If each question on the test was  worth ONE mark, how many questions in total were on the test?​

        ASSUME that in a test there are p questions.

  • According to the question Chris received a mark of 50% on a recent test.
  • So he has answered 1/2 p of the given questions correctly.
  • Also he has answered 13 out of first 20 questions correctly and 25% of the remaining questions.
  • So there are p – 20 questions after the first 20 questions.
  • So 25% of p – 20 questions will be 25/100 (p – 20)
  • THEREFORE total number of questions Chris answered correctly can be written as  
  • 1/2 p = 13 + 25/100 (p – 20)
  • 1/2 p = 13 + 1/4 (p – 20)
  • 1/2 p = 52 + (p – 20) / 4
  • 2p = 52 + p – 20
  • Or p = 32

Therefore total number of questions was 32

Reference link will be

brainly.in/question/18917598


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