A group of birds occupied the branches of a tree, one bird per branch, leaving one bird without a branch. After some time, they rearranged themselves with two birds per branch, which left exactly one branch unoccupied. Find the number of branches on the tree.

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?