Tacy has some roses. she has 5 more pink roses than red roses. she has twice as many yellow roses as pink roses. she has 8 red roses. how many roses does stacy have altogether? student's solution: work backwards stacy has 8 red roses. she has 5 more pink roses than red roses (8 + 5 = 13). she has twice as many yellow roses as pink roses (13 × 2 = 26). so stacy has 8 +13 + 26 or 47 roses. use a similar strategy to solve this problem. donna has some notebooks. she has 4 more blue notebooks than green notebooks. she has 3 times as many black notebooks as blue notebooks. she has 6 green notebooks. how many notebooks does donna have altogether?