# A Can Do a Work in 15 Days and B in 20 Days. If They Together Work on It for 4 Days; What Fraction of the Work Will Be Left? - Mathematics

Sum

A can do a work in 15 days and B in 20 days. If they together work on it for 4 days; what fraction of the work will be left?

#### Solution

A's 1-day work = 1/15

B's 1-day work = 1/20

(A+B)'s 1-day work =1/15+1/20

=(4+3)/60=7/60

(A+B)'s 4 days work =7/60xx4=7/15

Remaining work =1-7/15=(15-7)/15

=8/15

Concept: Time and Work
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#### APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 10 Direct and Inverse Variations
Exercise 10 (E) | Q 3 | Page 133