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The arithmetic mean of the weight of 12 cars is 1.2 tonnes. The average weight decreases by 30 kgs when a car is removed from the group. Find the mass of the removed car. | |
A. | 1.3 tonnes [Wrong Answer] |
B. | 1.53 tonnes [Correct Answer] |
C. | 1.17 tonnes [Wrong Answer] |
D. | 1.42 tonnes [Wrong Answer] |