Question

please solve this .....
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Answer 1

$\huge\underline\orange{\mathcal Answer}$

$\large\blue{\boxed{\mathcal No\:Of\:Days(N)=30}}$

$\huge\underline\orange{\mathcal Solution}$

15 men do 4hours each day on 43 days

total work duration : N

let it be

Number of hours women put in to complete work = 21×N×6=126N

Hence,

126N×2/3 = 2520

as

2 men = 3 women

$\huge{\boxed{\mathcal N=30}}$