@SHAKHI There is two things which we have to remember in that set
Irfan has to practice all three aspects on a particular day.Three should not be gap of more than two days. Now coming to your doubt.. among 3rd,4th and 5th day is the day where he practices all three aspects. If he does practices on 4th day then the gap between fielding is 3 days. Same case with 3rd day also. 5th day is the day which is satisfying above cases. Hence 5th day is wednesday. I hope it's clear now.
@surya_prakash There are 200 students in a class. 20% students are there who don’t like any subject. 50% students like physics, 60% students like Chemistry and 70% students like Mathematics.
I + II + III = 100 - 20 = 80......(1)
I + 2II + 3III = 50+60+70 = 180.....(2)
Now if we put I = 0 then
II + III = 80....(3)
2II + 3III = 180....(4)
II should be maximum so that III cold be minimum.
Now equation (4) - 2 x equation (3)
III = 20.
This 20 is percent actually.
20% of 200 = 40.
I hope it's clear now.
Q 5) In a family of seven people A, B, C, D, E, F and G there is exactly one pair of twins. B is younger than F but older than E, G and D. C is younger than E but older than A and D. G is younger than F and E. Which of the following can be the pair of twins?
(a) B, C
(b) A, E
(c) C, G
(d) F, G