The numbers 72, 8, 24, 10, 5, 45, 36, 15 are grouped in pairs so that each pair has the same product. Which number is paired with 10?

The answer is 36

If each pair has the same product then we must multiply the greatest number with the smallest number, and multiply the second greatest number with the second smallest number and so on

Here are your numbers ordered
5 8 10 15 24 36 45 72

If you multiply each pair, you will get 360
And 10 matches with 36