### Discussion :: Table Charts - Table Chart 4 (Q.No.3)

Study the following table and answer the questions.

Classification of 100 Students Based on the Marks Obtained by them in Physics and Chemistry in an Examination.

Subject | Marks out of 50 | ||||

40 and above | 30 and above | 20 and above | 10 and above | 0 and above | |

Physics | 9 | 32 | 80 | 92 | 100 |

Chemistry | 4 | 21 | 66 | 81 | 100 |

Average (Aggregate) | 7 | 27 | 73 | 87 | 100 |

Vinod Tripathi said: (Mar 8, 2012) | |

I didn't get ths caclculation in any way help me in a siple way. |

Pradeepika said: (Apr 3, 2012) | |

Here they have mentioned that students getting at least 60% marks in chemistry. My question is why can't we take students who scored 40% and above then the calculation will go this way. Students who scored 30% and above=21. Students who scored 40% and above=4. Total = 21+4 = 25. Similarly for students who scored aggregate marks. Why it is taken from 20% and above it can go lower. Or it could be taken directly from 40% and above that means only 7 is taken into consideration. |

Shashi said: (Dec 17, 2012) | |

At-least consider minimum to minimum so, 60% of chem=50*0.6=30 (so 21). similarly 40% of agg=50*0.4=20 (so 73). Finally, (21/73) *100=28.77==29%. |

Banu said: (Sep 17, 2014) | |

@Pradeepika. 30 and above i.e. 40 is above 30 only so no need to include 40 and above as it is already in 30 and above. |

Rajnish said: (Apr 4, 2015) | |

Fast calculation using fraction: (21/73)*100~(20/70)*100 = (2/7)*100 = (2*1/7)*100 = (2*14.28)*100 = 28.56%. So answer approximately 29%. |

Chandan said: (Oct 10, 2015) | |

Why we are not take 50*0.6 equal to 40? |

Krishna said: (Feb 22, 2017) | |

30 and above marks students comes under 60% = 27 students. 40 and above marks students comes under 20% = 73 students. Here they are asking " The percentage of number of students getting at least 60% marks in Chemistry over those getting at least 40% marks in aggregate ". Therefore we calculate 27/73 X 100. By solving, we will get the answer. |

Nandhu said: (Jul 4, 2017) | |

Actually (60/100)*50=30...so yu go 30and above in chemistry. now you get 21, keep it safe...then you must go to aggregate atleast40% (40/100)*50=20. so you go 20and above in aggregate, now, you get 73. Then you find the required percentage ..(21/73)*100=28.77% ~=29%. |

Sushmitha said: (Apr 25, 2018) | |

Please, anyone explain this to me. |

Farhin said: (May 14, 2019) | |

60% of chemistry means (60/100 * 50) =30. So we have to take 30 above in chemistry i.e =21. 40 % of aggregate means (40/100 *50) = 20. So we have to take 20 above in aggraget i.e = 73 Now we have to find a percentage so (21/73 *100). Hence we get (28.77). |

Haritha said: (Aug 20, 2019) | |

Aggregate score in chemistry is 73. |

Geetha said: (Apr 29, 2020) | |

Thank you @Farhin. |

Anchal said: (Oct 29, 2020) | |

Marks that given which is out of 50. 60% of 50 = 30 & 40% of 50 = 20. For chemistry above 60% i.e above 30 = 21 & for aggregate above 40% i.e above 20 = 73. Percentage = 2100/73 = 28.76% ~ 29%. |

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