In which type of chemical reaction do crystals of ferrous sulphate lose water on heating and the colour of the crystals changes from light green to white?
On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. The reaction is called Decomposition reaction.
A sum of money invested at simple interest amounts to Rs. 16800 in 2 years and to Rs. 23100 in 9 years. What is the rate of simple interest per annum?
If the student scores 27% of the marks, then he has failed by 186 marks. But if he scores 54% marks then he is passed by 246 marks. Find the passing per...
Rajesh spent 46% of his monthly income on food and 54% of the remaining of study. If total monthly savings (after spending on food and study) of Rajesh ...
In an election, two candidates participated. 20% voters did not cast their votes, out of which 600 votes declared invalid and the winner get 75% of the ...
The salary of a man increased from Rs. 16000 per month to Rs. 18000 per month. Find the increase percent.
Monthly income of A and B is Rs. (x + 1500) and Rs. x, respectively. If monthly income of A is increased by 12.5% while that of B is decreased by 25% th...
A book is listed at Rs. 2,400 and the discount offered is 10%. What additional discount must be given to bring the net selling price Rs. 1,800?
The population of the town is 10,000. If the male population increases by 5% and the female population by 10%, the population will become 10,700. How mu...
There are 100 students in a particular class. 55% students play rugby, 30 % play basketball and 15% play both the games. What is the number of students ...
A number reduced by 33% becomes 335. What percent should it be increased so that it becomes 950?
