Panel house

The construction company has two groups of workers. Group A has more members than B. Panel house was insulated by group A in 10 days. The same block of flats was insulated together in 6 days. How many days would group B block insulate?

Correct result:

b =  15


6 (1/10+1/b)=1  6 (b/10+1)=b  4b=60  b=15

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