Hello everyone . Trying to solve the next series . 90 85 86 80 75 ? what the number after 75 ? ​

Bonjour,

90 85 86 80 75 ?

what the number after 75 ? ​

C'est 76

Tu as 90 -5 = 85

ensuite 85 + 1  = 86

ensuite 86 - 6 = 80

ensuite 80 -5 = 75

DONC : 75 + 1 = 76