Aptitude - Average - Discussion
Discussion Forum : Average - Data Sufficiency 2 (Q.No. 1)
Directions to Solve
Each of the questions given below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statement(s) is/are necessary to answer the question.
1.
How many marks did Tarun secure in English? | |
I. | The average mark obtained by Tarun in four subjects including English is 60. |
II. | The total marks obtained by him in English and Mathematics together are 170. |
III. | The total marks obtained by him in Mathematics and Science together are 180. |
Answer: Option
Explanation:
I gives, total marks in 4 subjects = (60 x 4) = 240.
II gives, E + M = 170
III gives, M + S = 180.
Thus, none of (A), (B), (C), (D) is true.
Correct answer is (E).
Discussion:
17 comments Page 1 of 2.
Lakshmi S S said:
1 decade ago
Can any one tell me then what is required to solve this type of issues ?
Shobhit dube said:
1 decade ago
We know 4 subject their.
we know three subject name math,science,english.
i let 4th subject x.
then
e+M+S+X=240 ---------1
m+S=180-----------------2
put this in 1 eq.
e+x+180=240
e+x=60
x=e-60
this put in eq.1 and also put m+s=180
e+180+e-60=240
2e+120=240
2e=120
e=60 ans
we know three subject name math,science,english.
i let 4th subject x.
then
e+M+S+X=240 ---------1
m+S=180-----------------2
put this in 1 eq.
e+x+180=240
e+x=60
x=e-60
this put in eq.1 and also put m+s=180
e+180+e-60=240
2e+120=240
2e=120
e=60 ans
(1)
Manish said:
1 decade ago
@Shobhit Dube.
There are 4 Sub. and as per your sol; it shows
E=60 and M+S=180 hence Sum will be 240.
(240= 4 Sub). In such a case where is the marks of 4th sub.
There are 4 Sub. and as per your sol; it shows
E=60 and M+S=180 hence Sum will be 240.
(240= 4 Sub). In such a case where is the marks of 4th sub.
Shaby said:
1 decade ago
@Manish - I agree with you.
@Shohit Dube - your solution is wrong.
@Shohit Dube - your solution is wrong.
Bharat said:
1 decade ago
@Shohit Dube - your solution is wrong.
Because at least 2 equations needed to solve 2 variables.
{n - number of variables - then n equations needed for solving it }.
You can't use same equation for putting the value of x from which you have derived value of x.
Because at least 2 equations needed to solve 2 variables.
{n - number of variables - then n equations needed for solving it }.
You can't use same equation for putting the value of x from which you have derived value of x.
Bhushi said:
1 decade ago
What about one subject is having 0 marks?
Kanna said:
10 years ago
@Sohibit Dube.
Your solution is totally wrong as if x+e = 60 then e = 60-x not e-60.
Your solution is totally wrong as if x+e = 60 then e = 60-x not e-60.
Meet shah said:
9 years ago
Why 1 and 2 not an answer here it's only saying about English then why is it so?
(1)
Anant said:
8 years ago
We can obtain marks in English by this,
Marks in 4 subjects.
(E+M+S+X)/4=60.
E+M+S+X=240.
And
E+M=170 ---eqn1.
M+S=180----eqn2.
eqn2-eqn1 we get;
S-E=10,
S=10+E.
now substitute in here
E+(10+E)+170=240.
2E=60,
E=30.
Marks in 4 subjects.
(E+M+S+X)/4=60.
E+M+S+X=240.
And
E+M=170 ---eqn1.
M+S=180----eqn2.
eqn2-eqn1 we get;
S-E=10,
S=10+E.
now substitute in here
E+(10+E)+170=240.
2E=60,
E=30.
(5)
Bala said:
8 years ago
@Anant.
So the answer is all three?
So the answer is all three?
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