30 man completed 50 days 10 man leave after 20 days what is the total no. of days

i need the ans plz send replay..
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2 Answers

man-daes=30*50 +10*20

=1500+200

=1700
by
30 x 50= 30 x 20 + 20 x ?

1500=600+20 x ?

900=20 x ?

?=900:20=45

45+20=65
by Level 8 User (35.3k points)

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