Question: a can do a particular work in 6 days . b can do the same work in 8 days . a and b signed to do it for rs . 3360 . they completed the work in 3 days with the help of c . how much is to be paid to c ?
A) s . 380
B) s . 600
C) s . 420
D) s . 400
E) s . 480
Correct answer: C
Grade: 7 | Topic: Ratios and proportions | Difficulty: Medium | Standard: 7.RP.A.3