40 persons can repair a bridge in 12 days. If 8 more persons join them, then in how many days bridge can be repaired?
We know that $$M_1\times D_1 = M_2\times D_2$$ where M and D are Number of men and Number of days respectively.
Here, $$M_1 = 40, D_1 = 12, M_2 = 40+8 = 48$$
$$40\times12 = 48\times D_2$$
=> $$D_2 = 10$$
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