The price of commodity X increases by 40 paise every year, while the price of commodity Y increases by 15 paise every year. If in the year 2014, the price of commodity X was Rs. 4.20 and that of Y was Rs. 6.30, in which year will commodity X cost 40 paise more than commodity Y?

Find the number of solutions for the pair of linear equations: 5x − 7y + 28 = 0 and 10x + 14y − 28 = 0.

If 2p3 - 57 = 3, then the value of p is:

The cost of 2 sarees and 4 shirts is Rs. 1600. With the same amount of money, one can buy 1 saree and 6 shirts. If someone wants to buy 12 shirts, how much amount does he/she have to pay?