Answers

2016-06-23T19:25:14+08:00
A. 110
B. 630
Solution:
List the number of seats in 5 rows:
14, 18, 22, 26, 30.
  14
  18
  22
  26
+30
____
110 - answer in A

B. List all the 3 and add:
14 + 18 + 22 + 26 + 30 = 110
34 + 38 + 42 + 46 + 50 = 210
54 + 58 + 62 + 66 + 70 = 310
   110 + 210 + 310 = 630
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