In a partnership, A and B start a business by investing ₹20,000 and ₹25,000 respectively. After 4 months, C joins them with ₹15,000. Find the ratio of their profits at the end of the year.
A mixture contains milk and water in the ratio 5:2. If 4 litres of water is added, the ratio becomes 5:4. Find the initial quantity of milk in the mixture.
The ratio of the number of boys and girls in a school is 3 : 2. If 20% of the boys and 25% of the girls are scholarship holders, what percentage of the students does not get the scholarship?