1.

A and B together can complete a particular task in 8 days. If B alone can complete the same task in 10 days, how many days will A take to complete the task if he works alone ?

Answer»

28
36
40
32

Solution :LET the A can do the task in x days.
`1/x + 1/10=1/8` ltbgt `1/x = 1/8 - 1/10 + (10-8)/80 = 2/80 =1/40`
`x=40`
Alternate Solution:
If total work = 80 units
Then in 1 day (A+B) will do `80/10 =10` UNIT of work
`therefore` A does 2 unit of work each day
`therefore` A REQUIRES `80/2 = 40` days to COMPLETE work


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