If Joes extends the pattern in the bolt rowns include a ratio that has a first term of 10, what would be the second term of the ratio?

Question

Here is a multiplication table:

1	2	3	4	5	6	7	8	9
2	4	6	8	10	12	14	16	18
3	6	9	12	15	18	21	24	27
4	8	12	16	20	24	28	32	26
5	10	15	20	25	30	35	40	45
6	12	18	24	30	36	42	48	54
7	14	21	27	35	42	49	56	63
8	16	24	32	40	48	56	64	72
9	18	27	36	45	54	63	72	81

A.10

B.20

C.80

D.90

Answer 1

If an extra column or row is added to the table, the second term will be 20 because the second term in every row and column is twice the first (2*1=2, 2*2=4, ..., 2*8=16, 2*9=18, 2*10=20). Answer B.

The table has two errors: column 4 row 7 should be 28 not 27; column 9 row 4 should be 36 not 26.