A can do a work in 12 days, B can do it in 20 days and C in 15 days. If they work together the number of days needed to complete the work is:
A10
B3
C6
D5
A10
B3
C6
D5
Related Questions:
A can complete % of a work in 5 days and B can complete 40% of the same work in 10 days. They work together for 5 days and then B left the work. A alone will complete the remaining work in: