Question

A does 20% less work than B. if A can finish a work in 15/2 hours. how much will B take to finish it​

Answer 1

Step-by-step explanation:

a does 20%less meant he does 80%(100-20%)work

so y×80%=15÷2

80y/100=15/2

y=1500/160

y=9.375

Answer 2

Answer:

Ratio of percentage of work done by A and B = 80 : 100

Suppose B takes 'x' hours time to complete the work.

So,

⇒ 80 : 100 :: x : 15/2

⇒ 100x = 15/2*80

⇒ x = 600/100

⇒ x = 6 hours (Time taken by B)