Thomas owns 63 different stones. Under the condition that 1, 3, 5 stones are the same in 5, 3, 1 stones (as an example), how many ways can Thomas organize these stones into 3 piles, with an odd number of stones in each pile?

If kn = 9 cm, mn = 21 cm, rs = 42 cm, and ps = 18 cm, what is the scale factor of figure klmn to figure pqrs?

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?