SOLUTION: How do you find two whole numbers with a sum of 15 and a product of 54

Make a list of all the pairs of whole numbers that 
have a product of 54:

1 x 54 = 54
2 x 27 = 54
3 x 18 = 54
6 x 9  = 54

Then make a list of their sums

1 + 54 = 55
2 + 27 = 29
3 + 18 = 21
6 + 9  = 15

And what do you know!  That last pair 6 and 9 do indeed
have a sum of 15.

Answer: 6 and 9

Edwin