adding the middle 20 values of array 0-99

This may seem quiete easy to everyone else but I am struggling to comprehend it. I have to add up the numbers held in the middle 20 indexes of an array 0-99 but I cant work out from what index to what index I should add. Is it from 40-60? or is that 22 values?

Solution

index 40 - index 59 is your middle-range ;)

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