if its 10 to 8 and you have 15 m&m then you would have to do the 10 which you would have to put 8 then 5 is half of 10 so you would just half 8 which is 4 so 8+4+12. 12 Hershey bars needed to restock the shelf.
I’ll say C because they’re the same terms as in In so In 7 + In 5 would be In 12 You only add 7 and 5 which 12 so that’s where the 12 comes from Hope that helped :)