The average weight of a class of 25 student is 60 KG. If X is student joined the class, than the average weight of whole class increases by (2X – 7)Kg. Find the value of X if the weight of whole class increases by 390 KG.
Sum of weights of 25 student = 25*60 = 1500 kg Sum of the weights of (25+x)(60+2x-7) = {(25+x)(53+2x)} kg As per the question (25+x)(53+2x)-1500 = 390 (25+x)(53+2x) = 1890 2x2+103x-565=0 X= 5 or (-113/2) Student since the number of student cannot be negative. So our answer will be 5
In the following question a sentence with four highlighted words is given. Choose which of the following pairs should be interchanged to make the senten...
Select the most appropriate option to substitute the bold segment in the given sentence. If there is no need to substitute,select no improvement/no sub...
Select the most appropriate option to substitute the highlighted segment in the given sentence. If there is no need to substitute it, select No impro...
It is important to make consumers aware of green options between products in terms of the underlying technologies, and incentivise adoption through ta...
During the investigation, some materials containing radical literature were found, (A)/ who included a book on caste issues in India (B)/ and a trans...
When I was a candidate, the polls said that the majority of voters disagreed in my opposition to the death penalty.
...The monsoon cycle is prone to large variations, and every year, regional factors get accentuated which then leads to extreme climate events .
...The company intending in grab as large a slice of the Chinese market as possible.
Participants will have to learn any one of the Indian dance forms in the first year, yoga in the second year and any Indian martial art of the...
Terming the recent spate of cyberattacks a wake-up call for tech companies as well as governments, Mr. Smith said the world was more secure when netw...
