Question
The average height of each person in group 'I' having 36
people is 18 cm less than the average height of each person in group 'J' having 30 people. If the sum of the heights of all people in group 'I' is the same as that in group 'J', then what is the average height of a person in group 'J'?Solution
ATQ, Let the average height of a person in group 'J' = 'b' cm. Then, the average height of a person in group 'I' = (b - 18) cm. Total height of all people in group 'J' = 30 × b = '30b' cm. Total height of all people in group 'I' = 36 × (b - 18) = 36b - 648 cm. So, 36b - 648 = 30b. Or, 6b = 648. So, b = 648 / 6 = 108. Required average height = 108 cm.
1. While the idea of more green intuitively seems like a score for the environment, the shift from mossy tundra to towering forest will almost certainly...
In each of the questions given below, a sentence is given, divided into parts. One of the parts may contain an error. Identify the part that contains t...
Rapid urbanisation has leading to the migration of men folk from the village to cities in search of work.
...Shikha accidently broke Mrs.Laura’s beautiful glass today, but she was completely normal and said “ never mind “.
Reporters were informed that multiple checkpoints by various armed militant groups, (A)/ overflight clearances from different countries, (B)/and delay i...
It is the facts that she did not exhaust all the procedural avenues before her that has left her open to charges that her ruling has a political hue .<...
I hope the country’s condition (a) may go from bad to worse (b)/ unless all necessary steps / are taken to suppress terrorism. (c)/ No error (d)
Although he had prepared well (1)/ for the interview, (2)/ he could not answered (3)/ several of the technical questions (4)
Read each sentence to find out whether there is any grammatical or idiomatic error. The error, if any, will be in one part of the sentence. The number ...
I. Schools, colleges and another (A)/ educational institutions have remained (B)/ closed in Assam as well as rest of India (C)/ since March because of t...
Relevant for Exams:
