Hey there! I'm happy to help!
We want to find whatever is in between J and K. To find the halfway point between any two numbers, you add them and then divide that result by two!
What's between 1 and 3?
1+3=4
4/2=2
So, we'll do the same here!
155+160=315
315/2=157.5
So, the midpoint is 157.5 or 157 1/2.
Have a wonderful day!