24/3 = 8

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Diff/actual value= 160000/560000*100 =28.57%

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logxy = 7

Log2x8y = 5

Logy/logx = 7

Logy= 7logx

Log x = (1/7) log y

Log8y/log2x = 5

(3log2 + logy)/(log2 + logx) = 5

(3log2 + logy)/(log2 + (logy/7)) = 5

3log2 + logy = 5log2 + 5logy/7

2log 2 = (2/7)logy

7 log2 = log y

Log27 = log y

Y = 27

Solving after taking LCM = 1461/693 = 487/231

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let akshay does daily = x/20 work

Bimal does daily = y/20 work

Chirag does daily = z/20 work

total work = (x +y+z)

let total time to complete the work is = t

so every group will do work for = t/3 time

work will be

(t/3)*(x/20 + y/20) + (t/3)*(y/20 + z/20) + (t/3)*(z/20 + x/20) = (x+y+z)

(t/3)*(x/10 +y/10 + z/10) = (x+y+z)

so t = 30 days

thus time taken to complete the work is 30 days