Answer is 98
The pattern is like this
2+3=8
8/2=4 4-1=3
3+7=27
27/3=9 9-2=7
It goes on like this divide the first no. from the sum and subtract subtract numbers from the answer u get in consecutive numbers. Like in 2+3=8 first 8 is divided by 2 u get 4 then subtract 1 from it then in next pair (3+7=27) do the same process i.e 27/3=9 but subtract 2 from it then in next pair do the same but subtract 3 like that then 4 and so on. At last u will get the answer 98.