Question

I have some question about data structure(array address).

Suppose there is a row-major array A[n][m], the address, with decimal system, of A[2][10], A[10][2], and A[20][20] is 740, 1508, and 2580, respectively. The size of each array element is d bytes.
(1) Find d.
(2) Find m.
(3) What is the beginning address of array A?

thanks