How this solution works what if the current element of the array is equal to num

I have tried many ways of solving this challenge and it seems not obvious for me in some cases

I have tried this one and it did not work because it might be the num is equal to the current array element we are looping in so I had to use >=

function getIndexToIns(arr, num) {
  arr.sort((a, b) => a - b);

  for(let i = 0; i < arr.length; i++){
    if(arr[i] > num){
      return arr[i]
  return arr.length

now with this solution how could return the right index when the array only returns the numbers there index less than num what if it is equal to the num ?

function getIndexToIns(arr, num) {
return arr.filter(numb => num > numb).length

getIndexToIns([40, 60], 50);

Challenge: Where do I Belong

Link to the challenge:

the second one counts how many numbers are smaller than the number to insert, if you confront that with the index, you may find out that, being arrays 0-indexed, it works perfectly

but why it did not work with first one?

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If you have [40, 40, 40] and the number 40, at what index should you add it?

if I had this array with my first solution it will return the arr.length. but for the second solution it will be on zero index

and what would be the correct number based on challenge requirements?

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