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in a test consisting of 90 questions, Ama answered 75% of the first 40 questions correctly. If she had to get a score of 80% in the test, (i) how many questions did she answer correctly out of the first 40 questions? (ii) how many questions should she answer correctly out of the 90 questions? (iii) what percentage of the remaining 50 questions should she answer correctly in order to get the 80%?​

Respuesta :

Answer:

total question =90

she obtained 75% of first 40 questions

  1. No. of question she got correct in first 40 = 75% * 40 = 30

2. in order to get 80% out of 90,

the no. of questions got correct by Ama = 80% * 90 = 72

3. As she already got 30 c0rrect in first 40 questions, the number of question she needs correct for remaining 50 = (72-30) = 42

percentage = 42/50*100% = 84%

The number of questions answered correctly on the first 40 questions  is 30.

The questions answered correctly of the 90 questions is 72.

The percentage answered correctly on the last 50 questions is 84%.

How many questions were answered correctly?

Percentage can be described as a fraction of an amount expressed as a number out of hundred.

Number of questions answered correctly on the first 40 questions: 40 x 0.75 = 30

Questions answered correctly of the 90 questions: 90 x 0.8 = 72

Number of questions gotten correctly on the last 50 questions: (0.8 x 90)  30 = 42

Percentage = 42/50 x 100 = 84%

To learn more about percentages, please check: https://brainly.com/question/25764815

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