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| 1. |
A can do a certain work in 12 days. B is 60% more efficient than A. How many days will B and A together take to do the same job ?1). $\frac{80}{13}$ days2). $\frac{70}{13}$ days3). $\frac{75}{13}$ days4). $\frac{60}{13}$ days |
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