Question
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.Solution
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
Result of the test is expected to be out sometimes next month
In the question below, a statement has three words highlighted in bold, which may or may not be correctly used. You are required to choose fro...
I. Students should get used to one of the formats as it will help them during their research.
II. Would you mind doing the chores today as I d...
Timely diagnosis and easily and widely availability of the drug are expected to reduce mortality.
I. They had a party to celebrate Tom’s birthday.
II. He is a driver who drives slower.
III. There is some chairs and a table.
In each of the questions given below a sentence is given with three words in bold. Choose the option which gives the correct sequence of these words to ...
The climb to the top is not for the ill-hearts , but if you manage to negotiate the 463 narrow steps from the inside, you will be grated by extraordinar...
Select the phrase from the options below that should replace the underlined phrase in the sentence to make it grammatically and contextually correct. I...
India, which has vivacious interests in the Gulf and enjoys good ties with the region’s many countries, cannot afford to be seen to be poli...
The project was a wild goose chase , and we ended up wasting a lot of time and resources.
Relevant for Exams:
