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Brand A costing Rs.9 per kg is mixed with brand B costing Rs.4 per kg to form a mixture worth Rs.7 per kg. How mang kgs of brand A are needed to make 40 kgs of the mixture? | |
A. | 12 kg [Wrong Answer] |
B. | 15 kg [Wrong Answer] |
C. | 18 kg [Wrong Answer] |
D. | 24 kg [Correct Answer] |