Question

A b and c alone can complete a work in 10 12 and 20 days respectively if they work together for 4 days what is the fraction of work that is left

Answer 1

Explanation:

TOGETHER OF ALL TO COMPLETE TO WORK = 14/60

(A+B+C)4 + REMAINING DAYS (A+B+C)X= 1

(1/10+1/12+1/20)4+ (A+B+C)X=1

14/60×4+(A+B+C)X=1

14/15+(A+B+C)X=1

(A+B+C)X=1-14/15

= 15-14

15

=1/15

Answer 2

Answer:

4(1/10+1/12+1/20)

=4(14/60)

=14/15

work left=1-14/15=1/15