Let +n+ = number of bottles of cranberry juice needed +2n+ = number of bottles of ginger ale needed --------------------------- +3.2n+%2B+.9%2A%28+2n+%29+=+20+ +3.2n+%2B+1.8n+=+20+ +32n+%2B+18n+=+200+ +50n+=+200+ +n+=+4+ and +2n+=+8+ ---------------- The most bottles of cranberry juice is 4