Question

24. A does 20% less work than B. If A can complete a piece of
work in 7 hours, then B can do it in
7/11
(a) 6 hours
(c) 10 hours
(b) 8 hours
(d) 4 hours​

Answer 1

Step-by-step explanation:

work of A =(1-20%)B

A=0.8B

A:B = 8:10 is ratio in which they work

so the ratio of no. of days taken

A:B = 10:8

10parts is 7hrs

8 parts is7/10 ×8 =28/5=5 3/7 hrs

so B takes approximately 6hrs