Question

here is a list of numbers -45,-21,-16,12 33 ,40. write down two numbers from the list below that have a difference of 29, work out the sum of all numbers in the list.

Answer 1

-45 - -16 = 29, sum is 3

Answer 2

a) we want two numbers where the difference of them is equal to 29. Where the difference between the numbers a and b is = a - b

You can use brute force here, this is, try for every option and find the correct one.

-45 - (-21) = -45 + 21 = -24, that pair is not the correct option

-45 - (-16) = -45 + 16 = -29, well, here we find that the difference between these two numbers is 29 units, so the correct option here is -45 and - 16.

b) The summ of all the numbers in the list is:

S = -45 +(-21) + (-16) +12 +33 +40 = 3

So the total sum of the numbers in the list is 3