The daughter of one of the authors of this book is getting married in three weeks (as of writing this exercise; true story), and she needs to make up some flower bouquets for her four bridesmaids (also true). She wants to have a total of 200 flowers in each bouquet, and each bouquet needs to contain roses, rengarenga, or long blades of grass (not true). Roses cost $3 each, rengarenga cost $2 each, and blades of grass are free, but the bride wants twice as many rengarenga as roses (because rengarenga are native to New Zealand, and roses aren’t). However, because the bride’s father is really mean and grumpy (not true, of course), he is only allowing the bride to spend a total of

$28 for all the bouquets. Write a system of equations that you would need to solve to determine how many roses, rengarenga and blades of grass need to be in each bouquet.