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Two pick ups were used to collect garbage from a market. Each pickup carried 2 tonnes 300kg of garbage per trip. Each pickup was to make five trips. After the fourth trip one of the pickup broke down and did not carry the garbage. What was the total mass of garbage collected?
A. 23 tonnes 0kg
B. 20 tonnes 700kg
C. 18 tonnes 400kg
D. 11 tonnes 500kg