Simon saved $6 in the first week and increased his savings by $5 each week. How much would he have saved at the end of 9 weeks?
Make a list: 6, 11, 16, 21, 26, 31, 36, 41, 46
Using rainbow method: 6 + 46 = 5211 + 41 = 5216 + 36 = 5221 + 31 = 52Sum of each pair = 52Number of pairs: 4, left: 26 Sum of all pairs = [52 x 4] + 26 = 208 + 26 = $234 Answer(s): $234