7. A can finish a work in 15 days, B in 20days and C in 25 days. All t

1.	7. A can finish a work in 15 days, B in 20days and C in 25 days. All these threeworked together and earned 4700. TheCDS 2012)share of C is
Answer» A's 1 day's work =1/15 B's 1 day's work =1/20 C's 1 day's work =1/25 A, B and C worked together. Therefore,(A+B+C)'s 1 day's work =1/15+1/20+1/25 =(20+15+12)/300=47/300 Days taken to complete work by A, B and C working together =300/47 Therefore, Share of C =1/25×300/47×4700= Rs.1200

7. A can finish a work in 15 days, B in 20days and C in 25 days. All these threeworked together and earned 4700. TheCDS 2012)share of C is

Answer»

A's 1 day's work =1/15

B's 1 day's work =1/20

C's 1 day's work =1/25

A, B and C worked together.

Therefore,(A+B+C)'s 1 day's work

=1/15+1/20+1/25

=(20+15+12)/300=47/300

Days taken to complete work by A, B and C working together

=300/47

Therefore, Share of C =1/25×300/47×4700= Rs.1200