Help please, I give many points! I need number 8 with the answer and an explanation as solved (((

105
Can be so: if to divide the sum of the lower numbers into 3, then the top number will turn out. (20+4): 3 = 24:3 = 8 (17+1): 3 = 18:3 = 6 (14+13): 3 = 27:3 = 9 - the passed number
370
Answer add