Answer :
10. 5 x (3+7) = 50
11. ?
12. 100 - (3x6+5) - 4 gets your 73, you cannot get 63 (from my understanding, but make sure)
11. ?
12. 100 - (3x6+5) - 4 gets your 73, you cannot get 63 (from my understanding, but make sure)