If a : b = 5 : 7, then (6a² - 2b²) : (b² - a²) will be:

If 39% of first number is equal to eight-ninths of second number, what is the ratio of first number to the second number?

The average price of three items of furniture is ₹15,990. If their prices are in the ratio 3 : 5 : 7, the price of the cheapest item (in ₹) is:

₹74,000 were divided among A, B and C, such that 9 times of A = 3 times of B = 7 times of C. Find the share of A.

If 20% of first number is equal to four-fifths of second number, what is the ratio of first number to the second number?

An amount of ₹658 is divided among three persons in the ratio of 18 : 12 : 2. The difference between the largest and the smallest shares (in ₹) in the distribution is:

Sohit and Rohit have a certain sum of money in the ratio of 17 : 14 and they spend their money on purchasing books in the ratio of 12 : 8. After purchasing books each of them has ₹3,392. Find the amount of money that Sohit initially had.​

A pouch contains 50 Paisa, 25 Paisa and 10 Paisa coins in the ratio 18 : 12 : 10, amounting to ₹130. Find the number of 10 Paisa coins.​

A bag contains 50 Paisa, 25 Paisa and 10 Paisa coins in the ratio 16 : 8 : 20, amounting to ₹384. Find the number of 10 Paisa coins.​