The ratio of the number of coins of 25 paise, 50 paise, Rs.2 and Rs.5 is 5 ∶ 4 ∶ 3 ∶ 1, respectively. If the total amount of the coins is Rs.285, then the difference between the number of 25 paise and Rs.5 coins is:

A, B and C invested capital in the ratio of 3 : 4 : 8. At the end of the business term, they received the profit in the ratio of 2 : 3 : 5. What is the ratio of their invested time?

The ratio of the incomes of two employees is 7 : 4, and the ratio of their expenditures is 3 : 1. If each of them manages to save ₹4,800 per month, find the sum of their monthly incomes (in ₹). 

A, B and C did certain investments and the ratio of their time periods is 3 : 2 : 7respectively. Ratio of  the profits of A, B and C is 4 : 3 : 14 respectively. What is the ratio of the investments of A, B and C?

Find the ratio between the fourth proportional of 12, 16, 6 and the third proportional of 4, 6.

Given that y is directly proportional to x and y = 2 when x = 8. Find the value of x when y = 8.

The average age of a man and his son is 55 years. The ratio of their ages is 7 : 4, respectively. What will be the ratio of their ages after 6 years?

The ratio of the monthly incomes of A and B is 11 : 13 and the ratio of their expenditures is 9 : 11. If both of them manage to save ₹4,000 per month, then find the difference in their incomes (in ₹).