A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. The different types of chemical reactions are combination, decomposition, single displacement, double displacement, reduction and oxidation reactions (redox reactions). Corrosion is not a type of chemical reaction. It is a process which involves a chemical reaction.
The number of boys and girls in a school is 180 and 260 respectively. 25% of boys left the school while 40 girls took admission in the school. Find the ...
In 2018, an online course had 'r' subscribers. Subscribers increased by 50% in 2019 and another 25% in 2020. However, in 2021 subscribers decreased by 4...
In a village election between two candidates, the winner secured 54% of the total votes cast and won by a majority of 4000 votes. How many votes did the...
A scored 40% marks and failed by 40 marks whereas B scored 70% marks, which was 80 more than the passing marks of the examination. Find the total marks ...
A man donated 10%, 16% and 28% of his income to three NGOs ‘A’, ‘B’ and ‘C’, respectively. They spent 75%, 80% and 50% of respective sums re...
The ratio of the number of males and females in an apartment is 14:11. If 25% of the males and 25% of the females read newspapers out of 200 persons, t...
Four friends, A, B, C, and D, went out for lunch. A paid 40% of the total bill. From the remaining amount, B paid 40%. Of what was left, C paid 50%. D p...
Gaurav spends 25% of his salary on grocery and 35% of the remaining amount on electricity bills. If Gaurav saves Rs. 33637.5, what is his total salary?
The total strength of school A is 20% more than that of school B. In school A and B, out of total number of students, 20% and 50% respectively are girls...
The marks obtained by A is 25% more than B, and the marks obtained by C is 150 more than the difference of the marks obtained by A and B. If C obtained ...
