A is 20% more efficient than B. If B can complete a piece of work in 30 days, then in how many days can both A and B complete the work

1) 11*5/11
2) 13*7/11
3) 15*7/11
4) 17*5/11

• b takes 30 days
  A will take 30*100/120=25 days
  so both will take= 25*30/(25+30)
  150/11
  13_7/11 days is solution
• 11 years agoHelpfull: Yes(0) No(0)