Question

A is thrice as good a workman as b and takes 10 days less to do a piece of work than b takes. b alone can do the whole work in

Answer 1

ratio of time taken by a and b = 1:3
means b will take 3 times which a will do in 1 time
if difference of time is 2 days b takes 3 days
if difference of time is 10 days b takes 3/2*10 = 15 days... :( sorry in hurry i read the question wrong:( the process of the picture is wrong :) now hope it helps:)

Answer 2

let we take a and b as x

3x=x+10
=3x-x=10
=2x=10
so x =10/2=5
5days is the answer