Eric saved $5 in the first week and increased his savings by $3 each week. How much would he have saved at the end of 9 weeks?
Make a list: 5, 8, 11, 14, 17, 20, 23, 26, 29
Using rainbow method: 5 + 29 = 348 + 26 = 3411 + 23 = 3414 + 20 = 34Sum of each pair = 34Number of pairs: 4, left: 17 Sum of all pairs = [34 x 4] + 17 = 136 + 17 = $153 Answer(s): $153