Question
A can complete a work in 20 days, B in 30 days and C in
60 days. All three start working together. After 2 days, C leaves. Four days before the work is finished, B also leaves and only A works in those last 4 days. In how many days is the work completed?Solution
A’s 1-day work = 1/20 B’s 1-day work = 1/30 C’s 1-day work = 1/60 First 2 days: all three work Daily work = 1/20 + 1/30 + 1/60 = (3 + 2 + 1)/60 = 6/60 = 1/10 Work done in 2 days = 2 × 1/10 = 1/5 Last 4 days: only A works Work done = 4 × 1/20 = 4/20 = 1/5 So work done in first 2 days + last 4 days = 1/5 + 1/5 = 2/5 Remaining work = 1 − 2/5 = 3/5 This remaining work is done by A and B together. A+B daily work = 1/20 + 1/30 = (3 + 2)/60 = 5/60 = 1/12 Let total time = T days. Then time when both A and B work together = (T − 2 − 4) = T − 6 So: (T − 6) × 1/12 = 3/5 T − 6 = 36/5 T = 36/5 + 6 = 36/5 + 30/5 = 66/5 = 13.2 days
Suneet walked 10 m towards the north, then he turned left and walked 11 m, then from there he turned right and walked 13 m, and then he turned right aga...
Three of the following four letter-clusters are alike in a certain way and one is different. Pick the odd one out.
AFKP
GKPS
SXCH
JOTY
A series is given with one term wrong. Select that wrong term from the given alternatives.
8, 17, 36, 74, 154
Which of the following terms will replace the question mark (?) in the given series?
GASM, CCOO, YEKQ, ? , QICUÂ
Select the correct mirror image of the given figure when the mirror is placed at MN as shown below.
In the following question, select the figure which can be placed at the sign of question mark (?) from the given alternatives.
Which of the following letter-clusters will replace the question mark (?) in the given series?
YTM, AQQ, CNU, ?, GHC
Which of the following numbers will replace the question mark (?) in the given series?
13,14,23,48,97,178,?
Which of the following numbers will replace the question mark (?) and complete the given number series?
15, 19 , 21, 25 , 27, ?
What should come in place of the question mark (?) in the given series?
666 676 687 699 712 ?
Relevant for Exams:
