Answer: 20 Cantaloupes will fetch 120 Raspberries.
Explanation:
C = Cantaloupes
T = Tomatoes
G = Grapes
R = Raspberries
Conversions (exchange rates):
2T/C
2 G/T
1.5 R/G
Start with 20C
20C*(2T/C) = 40T
40T*(2 G/T) = 80G
80G*(1.5 R/G) = 120R
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