**I KNOW THIS IS SOLUTION BUT I DON'T KNOW WHY?**

We first find the difference of the numbers and then find the HCF of the got numbers.

183−91=92

183−43=140

91−43=48

Now find HCF of 92, 140 and 48, we get

92=2×2×23

140=2×2×5×7

48=2×2×2×2×3

HCF(92, 140, 48) = 4

Therefore, 4 is the required number.

**Can you explain how we get correct answer using this method.**