Question

It is estimated that a building is constructed by 10 masons in 9 months . If 4, new masons join them, how long the same building will take to complete.​

Answer 1

Answer:

6.43

10 person complete 1/9 in a day

1 person complete 1/90 in a day

hence, we have 14 masons

90/14 =6.428

=> 6.43 rounded off