Ans is 47..substract the no with their starting no..so 84-8=76,76-7=69,69-6=63,63-6=57,57-5=52,52-5=47
Answer is 47 (decrement by the first digit of the number)
Subtracting the initial digit of a number from that number gives the next number... So, next number of 52 will be
52-5 = 47.