Question

the person a and b can complete a work in 10 days and 15 days respectively. b starts the work and after 5 days a also joins him. in all, the work would be completed in :

Answer 1

solution:-

A= 10 DAYS
B= 15 DAYS

NOW HIS L.C.M. = 30

NOW CAPICITY OF ONE DAY WORK
A = 3
B= 2

NOW ONLY A'S WORK OF 5 DAYS = 5×3= 15


AND AFTER 5 DAYS LATER

A+B= 3+2= 5 HERE IS CAPICITY OF A+B OF ONLY ONE DAY

NOW ALL WORK - COMPLETE WORK = 30-15= 15


NOW AVAILABLE WORK÷A+B CAPICITY


NOW 15÷5 = 3 DAYS

A+B = 3 DAYS

5 DAYS WORK OF A + (A+B WORK COMPLETED)


》》 5+3= 8 DAYS
ALL WORK COMPLETED IN 8 DAYS