susan ella and dolly can together complete a task in 10 days,ella dolly and kate can together complete in 15 days,and ella and dolly take 30 days to complete the same task.determine the number of days that all the 4 girls will take to complete the task while working together.
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work done in one day by Susan=1/10-1/30=1/15
work done in one day by Kate = 1/15-1/30=1/30
work done in one day by 4 girls = 1/15+1/30+1/30=4/30=2/15
total days=15/2 = 7.5 days
work done in one day by Kate = 1/15-1/30=1/30
work done in one day by 4 girls = 1/15+1/30+1/30=4/30=2/15
total days=15/2 = 7.5 days
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