### Discussion :: Average - Data Sufficiency 2 (Q.No.1)

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.

Lakshmi S S said: (Dec 14, 2011) | |

Can any one tell me then what is required to solve this type of issues ? |

Shobhit Dube said: (Oct 15, 2012) | |

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 |

Manish said: (Dec 12, 2012) | |

@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. |

Shaby said: (Jan 9, 2014) | |

@Manish - I agree with you. @Shohit Dube - your solution is wrong. |

Bharat said: (Oct 17, 2014) | |

@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. |

Bhushi said: (Apr 18, 2015) | |

What about one subject is having 0 marks? |

Kanna said: (Jan 31, 2016) | |

@Sohibit Dube. Your solution is totally wrong as if x+e = 60 then e = 60-x not e-60. |

Meet Shah said: (Aug 1, 2016) | |

Why 1 and 2 not an answer here it's only saying about English then why is it so? |

Anant said: (Jun 16, 2017) | |

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. |

Bala said: (Jul 25, 2017) | |

@Anant. So the answer is all three? |

Ankur said: (Feb 9, 2018) | |

@Anant. According to the question he got 60% (avg. Of 4 sujects). It means each subject carrying 100 marks but as per your solution, he got 150 marks in maths. |

Ankur said: (Feb 9, 2018) | |

Also M+E= 180 so M is 150. But S+M= 170 S= 40 Here M= 130. |

Bhavya said: (Mar 13, 2018) | |

Answer should be the option : D, right. |

Susmitha said: (Jul 19, 2019) | |

@All. Here, They are just asking English marks. While 1 and 2 are definitely giving the marks of English. My answer is both 1 and 2 are right. Those statements give marks of English clearly. |

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