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akurathi12
GMAT 1: 490 Q47 V13
Posts: 111
24 Jan 2019, 09:11
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C
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In a semi-annual exam, the highest and the lowest scores of a class were 45 and 15 respectively. The final exam marks were calculated by adding 5 to 1/3 of marks obtained in semi-annual exam. What is the difference between the range of marks in the semi-annual exam and the range of marks in the final exam?
A. 10
B. 15
C. 20
D. 30
E. 40
A. 10
B. 15
C. 20
D. 30
E. 40
KanishkM
Joined: 09 Mar 2018
Last visit: 18 Dec 2021
Posts: 755
Given Kudos: 123
Location: India
Schools: DeGroote'21 Desautels '21 NUS '21
24 Jan 2019, 09:58
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akurathi12
Semi annual exam
Highest score 45
Lowest score 15
The final exam marks were calculated by adding 5 to 1/3 of marks obtained in semi-annual exam(ADD Carefully)
Highest score will become 5 + 15 = 20
Lowest score will become 5 + 5 = 10
Now the difference will be (45-15) - (20-10)
20
OA C
05 Oct 2020, 23:04
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In the semi annual exam the difference between the highest and lowest marks = 45 - 15 = 30
Now, we are told that the final exam marks were calculated by taking 1/3 rd of the marks and adding 5. Since the same mathematical operation is done in both places, the difference in marks in the final exam is 1/3rd the the difference in marks in the semi annual exam.
Difference in the final exam = 1/3 (Difference in the semi annual exam) = 1/3 (30) = 10
Therefore the difference between these 2 values = 30 - 10 = 20
Option C
Arun Kumar
Now, we are told that the final exam marks were calculated by taking 1/3 rd of the marks and adding 5. Since the same mathematical operation is done in both places, the difference in marks in the final exam is 1/3rd the the difference in marks in the semi annual exam.
Difference in the final exam = 1/3 (Difference in the semi annual exam) = 1/3 (30) = 10
Therefore the difference between these 2 values = 30 - 10 = 20
Option C
Arun Kumar
