I need help, please

Question

Flannery used 30 lilies and 78 roses to create six identical flower arrangements. Write an equation to describe the relationship between l, the number of lilies, and r, the number of roses.

Answer 1

30 lillies and 78 roses add to 108 flowers.

If you want 6 identical flower arrangements, then each one will have 108/6 = 18 flowers. Each arrangement will have 30/6 lillies and 78/6 roses or 5 lillies and 13 roses.

Let A = arrangement, L = lillies and R = roses.

A = 5L + 13R will satisfy the conditions of the problem.