Dylan saved $6 in the first week and increased his savings by $6 each week. How much would he have saved at the end of 9 weeks?
Make a list: 6, 12, 18, 24, 30, 36, 42, 48, 54
Using rainbow method: 6 + 54 = 6012 + 48 = 6018 + 42 = 6024 + 36 = 60Sum of each pair = 60Number of pairs: 4, left: 30 Sum of all pairs = [60 x 4] + 30 = 240 + 30 = $270 Answer(s): $270