Question
A person buys books at Rs. 300 for 5 and sells them at
Rs.740. How many books must he sell in order to earn profit of Rs. 3,520?Solution
C.P. of 5 books = Rs.300 S.P. of 5 books = Rs. 740 ∴ Profit earned by selling 5 books = Rs. 440 Rs. 440 is earned by selling 5 books. ∴ Rs.3, 520 will be earned by selling 
= 40 books.
What is dehydration?
When a body falls freely
The process of converting a solid directly into its vapor is called:
A mixture of carbon monoxide and hydrogen is known as ______
The device that converts AC into DC is:
The washing machine works on the principle of -
Which particle is associated with Bose-Einstein Condensate?
The process of depositing a layer of any desired metal on another material by means of electricity is called:
If water smells bad, then that odor can be removed by adding:
The force of attraction between the particles of matter is maximum in______.
