Answer:
Explanation:
b + m = 20
b = 2/3m
2/3m + m = 20
2/3m + 3/3m = 20
5/3m = 20
m = 20 * 3/5
m = 60/5
m = 12 days <=== mountains
b = 2/3(12)
b = 24/3
b = 8 days <====== beach
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