Question
Working together A and B can do a job in 40 days, B and
C in 36 days and all three together in 24 days. In how many days can B alone do the job?Solution
Given that three people together can do the work in 24 days (1/a)+(1/b)+(1/c)=1/24 Also given (1/b) +(1/c)=1/36 1/a =1/24 - 1/36 1/a =(3-2)/72 a=72 days (1/72)+(1/b)=1/40 (1/b)=(1/40)-(1/72) (1/b)=9-5/360 1/b =1/90 b=90 days
What will come in place of the question mark (?) in the following series?
1528, 1416, 1204, ?, 480, -32
143 Â Â Â Â 119Â Â Â Â 107Â Â Â Â 101Â Â Â Â Â 98Â Â Â Â ?
96 89 ? 90 94 91
...What value should come in the place of (?) in the following number series?
19, 235, 260, 324, 333, ?
What will come in place of the question mark (?) in the following series?
305...
In each of the following number series, one term is missing. Find the missing term.
3, 5, 20, 24, 144, 150, ?
1029, 1030, 1039, 1064, ?, 1194
75, 80, 95, ?, 155, 200
What will come in place of the question mark (?) in the following series?
1515, 184, ?, 455, 967, 624
7 29 61 ? 211 349
...
