5-24,3-40,8-15, 12-...?

What is the missing number?

To find the missing number in the given sequence, let's analyze the pattern between the pairs of numbers.

For the first pair, 5-24:
If we subtract 5 from 24, we get 19.

For the second pair, 3-40:
Subtracting 3 from 40 gives us 37.

For the third pair, 8-15:
Subtracting 8 from 15 gives us 7.

Looking at the differences between the pairs, we can see that they are decreasing by 2 each time.

So, to find the missing number in the fourth pair, we need to subtract 12 from the last available difference (which is 7):

7 - 12 = -5

Therefore, the missing number in the sequence is -5.