1.

8. A e B together can do a piece of world in15 days & 'A' alone can do it in 30 days. Howlong will s take to complete the hwork?​

Answer»

ANSWER:

30 day

A+B = 15

A = 30

take the LCM of both 15 and 30 = 30

efficiency of A+B = 30/15=2....,....(1)

efficiency of A = 30/30 = 1

efficiency of B = 1 (from PUTTING the value of A in EQUATION 1)

now, day taken by B is = 30/1= 30 day


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