3. Rahmat, Nurkholik, and Adi took a test. Each answered 60 questions correctly on the test, and 100 questions were completed by at least one of the three on the test. A question is considered easy if all three are able to do the question correctly on the test, and it is considered difficult if only one of the three is able to do the question correctly. For example, there are X easy questions and Y difficult questions on the test. Value of |X - Y|is А. О В. 20 С. 40 D. 60 E. 80

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
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3. Rahmat, Nurkholik, and Adi took a test. Each answered 60 questions
correctly on the test, and 100 questions were completed by at least one
of the three on the test. A question is considered easy if all three are able
to do the question correctly on the test, and it is considered difficult if
only one of the three is able to do the question correctly. For example,
there are X easy questions and Y difficult questions on the test. Value of
|X - Y|is
А. О
В. 20
С. 40
D. 60
E. 80
Transcribed Image Text:3. Rahmat, Nurkholik, and Adi took a test. Each answered 60 questions correctly on the test, and 100 questions were completed by at least one of the three on the test. A question is considered easy if all three are able to do the question correctly on the test, and it is considered difficult if only one of the three is able to do the question correctly. For example, there are X easy questions and Y difficult questions on the test. Value of |X - Y|is А. О В. 20 С. 40 D. 60 E. 80
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