(1,2)
(1,3)
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There are 2 factor pairs of 87:87 = 1 x 8787 = 3 x 29
There are 3 factor pairs of 18:18 = 1 x 1818 = 2 x 918 = 3 x 6
Divide 1, 2, 3, 4 and 6 into 36. The answers are the other halves of the factor pairs.
The factor pairs of 18 are (1 x 18), (2 x 9), (3 x 6)
20 has 3 factor pairs. Pairs are (1,20), (2,10) and (9,9)