(1) In a competitive exam consisting of 100 questions, each correct answer gets
2 marks and each wrong answer gets -1 mark. If a student has written 70 correct
answers and 30 wrong answers, what is his/her score?
(2) A submarine has gone 4000 ft deep into the sea. If it rises at a rate of 30 ft
per minute what is its position after 45 minutes?
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Answer:
Step-by-step explanation:
1)
Correct answers: 2 x 70 = 140 correct answers.
Incorrect answers: 30 x -1 = -30
Total correct answers = 2 x 100 = 200
140/200 = x/100
x = 70
The person's score is 70%.
2) 30 feet more minute
We have gone through 45 minutes
so, 30 x 45 = 1350 ft.
It's position after 45 minutes is 1350 ft.
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