Question
If average weight of a class is ‘y’ kg. If a
new student weighing 21 kg took admission, then the average weight is increases by 1 kg. If the weight of this student had been 16 kg then the average weight of the class would have decreased by 2 kg. Find ‘y’.Solution
Let the number of students in a class be x. Therefore, the total weight = xy According to question, => (x + 1) (y + 1) = xy + 21 => xy + x + y + 1 = xy + 21 => x + y = 20 ------ (i) If the weight of this student had been 18 kg then the average weight of the class would have decreased by 2 kg. => (x + 2) (y – 2) = xy + 16 => xy + 2y – 2x – 4 = xy + 16 => y – x = 10 ------ (ii) Solving (i) and (ii), we get => 2y = 30 => y = 15
The trade between Uttarakhand and Tibet was closed after which incident?
Approximately what percentage of India is covered by alluvial soil?Â
With the inclusion of Garba in 2023, how many cultural items from India have been featured on the UNESCO list of Intangible Cultural Heritage?
Where was the Urban Co-operative Bank (UCB) situated, whose license was cancelled by the Reserve Bank of India (RBI) in Dec 2023?
What is an example of the following?
Subramaniam and Naidu donate some money in a relief fund. The amount paid by Naidu is ₹ 125 more than that of Subramaniam. If the total money paid by ...
Who among the following activists actively participated in the campaign against the Narmada Valley Project?
Consider the following statements as per the latest report by the World Gold Council (WGC):
1. India is the world’s largest consumer of gold.
How many Grand Slam titles has Australian tennis player Ashleigh Barty won so far?Â
Embarked upon in 1965-66 as an integral part of the Green Revolution, the High Yielding Varieties Programme (HYVP) included which of the following crops?
