A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days?
A. 11 days B. 13 days
C. 20(3/17) D. 20(5/17)
@custom said:so pull up ur socks , i m putting problems.1. A litre of water evaporates from 6L of sea water containg 4% salt. Find the % of salt in the remaing solution.a. 5.5%b. 20/3%c. 3%d. 24/5%
option (d)
total salt in 6l of water = 4*6 =.24
salt will not get evaporated
so % of salt left = (.24/5)*100 = 24/5
@anticipator.lad said:Hurrah!!! mera IBPS bhi NAHI nikla..... One more failure added with me.
mera bhi nahi nikla...lol
@custom said:so pull up ur socks , i m putting problems.1. A litre of water evaporates from 6L of sea water containg 4% salt. Find the % of salt in the remaing solution.a. 5.5%b. 20/3%c. 3%d. 24/5%
bhai isme litle ka matlab toh clear karo..warna answer cant be determined rahega.
kyunki we cannt take assumption until and unless it is mentioned.
kyunki we cannt take assumption until and unless it is mentioned.
@custom said:A report consit of 20 sheets each of 55 lines and each such line consists of 65 characters . This report is reduced into sheet each of 65 ines such tat each lines consists of 70,characters . The percentage reduction in number of sheets is closest toa. 20b. 5c. 30d. 35
option a
no of character will be same ( let x be no of new sheets)
55*20*65= 65*70*x
x= 110/7 = which comes out to be b/w 15 and 16 (try not to solve in such cases)
% reduction = (4 or 5 /20) * 100 = btw 20-25
but as only 20 is given so go with it
@custom said:A report consit of 20 sheets each of 55 lines and each such line consists of 65 characters . This report is reduced into sheet each of 65 ines such tat each lines consists of 70,characters . The percentage reduction in number of sheets is closest toa. 20b. 5c. 30d. 35
bhai 20%.
total words in previous file are
20*55*65
new manner will consist the same words.
so
20*55*65=x pages *65*70
it will come 110/7 it is not totally divisible but we can assume that a page will be used as ful.
so 16 pages will be required
20-------------->>>>>>> 16
4/20*100= 20percent.
sahi hai kya?
total words in previous file are
20*55*65
new manner will consist the same words.
so
20*55*65=x pages *65*70
it will come 110/7 it is not totally divisible but we can assume that a page will be used as ful.
so 16 pages will be required
20-------------->>>>>>> 16
4/20*100= 20percent.
sahi hai kya?
@custom said:One bacteria splits into eight bacteria of the next generation. But due tobenviornment, only 50% of one generation can produce the next generation. If the seventh generation number is 4096 millio(M), what is the number in first generation?a. 1 Mb. 2 Mc. 4 Md. 8 M
option a
let the starting gen be x
so in 2st gen = (x/2) * 8 = 4x = 4^1 x
3nd gen = (4x/2)*8 = 16x= 4^2 x
4rd gen = (16x/2) * 8 = 64x= 4^3 x
so by this trend 7th gen = 4^6 x or 2^12 x
now 2^12 = 4096 so no of bacteria in starting gen = 1 million
@mukul1988 said:option ano of character will be same ( let x be no of new sheets)55*20*65= 65*70*xx= 110/7 = which comes out to be b/w 15 and 16 (try not to solve in such cases)% reduction = (4 or 5 /20) * 100 = btw 20-25but as only 20 is given so go with it
bhai you cannt take 15 pages but only 16.. logic is that you must need 15.78... but 15 wont be suffice
@surya003 said:SOLVE THIS...A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?A. 23 days B. 37 daysC. 37(1/2) D. 40 days
option : c
A does 4/5 of work in 20 days
in one day he does = 1/25 work or he takes 25 days to complete
now for 1/5 of work a and b work together for 3 days
=> 3/25 + (3/x) = 1/5
3/x = 2/25
or 1/x = 2/75
so b does whole work in 75/2 days
@surya003 said:SOLVE THIS...A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?A. 23 days B. 37 daysC. 37(1/2) D. 40 days
37(1/2) is the answer. sahi hai?
@mukul1988 said:option alet the starting gen be xso in 2st gen = (x/2) * 8 = 4x = 4^1 x3nd gen = (4x/2)*8 = 16x= 4^2 x4rd gen = (16x/2) * 8 = 64x= 4^3 xso by this trend 7th gen = 4^7 x or 2^12 xnow 2^12 = 4096 so no of bacteria in starting gen = 1 million
bhai awesome approach hai lekin
agar 4^7x hai toh 2^14 x nahi hona chahiye?
agar 4^7x hai toh 2^14 x nahi hona chahiye?
@surya003 said:A machine P can print one lakh books in 8 hours, machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines are started at 9 A.M. while machine P is closed at 11 A.M. and the remaining two machines complete work. Approximately at what time will the work (to print one lakh books) be finished ?A. 11:30 A.M. B. 12 noonC. 12:30 P.M. D. 1:00 P.M.
option d
first of take 1 lakh as 1 it will create less confusion
work done in 1 hour : P = (1/8) Q = (1/10) R = (1/12)
so all together in 2 hours = (2/8+ 2/10 + 2/12) = 37/60 from 9:00 - 11:00
work left = 23/60
work done by q and r in one hour = 1/10 + 1/12 = 11/60 from 11:00
=> in 2 hours the will do 22/60 of work
therefore will will be completed by 1 pm
@surajpandey said:bhai awesome approach hai lekin agar 4^7x hai toh 2^14 x nahi hona chahiye?
sry bhai 4^6 likhna tha mere edit karne se pehle tune quote kar diya
@surya003 said:A machine P can print one lakh books in 8 hours, machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines are started at 9 A.M. while machine P is closed at 11 A.M. and the remaining two machines complete work. Approximately at what time will the work (to print one lakh books) be finished ?A. 11:30 A.M. B. 12 noonC. 12:30 P.M. D. 1:00 P.M.
1 pe khatam ho jayegi. explanation toh mukul bhai ne de hi di.
@surya003 said:A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days?A. 11 days B. 13 daysC. 20(3/17) D. 20(5/17)
option b
there are two ways of doing efficiency ques
let if A take x days B will take 1.3x days
now 1 day work by A = 1/23 and by B = 10/23*13
together in 1 day = 1/23 (1+10/13) = 1/13 days
find the odd one out:-
1. a. 7 b. 15 c. 31 d. 57
2. a.1754 b.2690 c. 7324 d. 9611
3. a. 392 b.326 c.414 d.248
4. a.215 b. 126 c. 65 d . 28
5. a,5678 b.5467 c. 3456 d. 2345
@custom said:find the odd one out:-1. a. 7 b. 15 c. 31 d. 57
answer is 15
7= 2*2 + (2+1)
15- koi logic nahi
31= 5*5 + (5+1)
57= 7*7 + (7+1)
kya sahi hai ya galat?
7= 2*2 + (2+1)
15- koi logic nahi
31= 5*5 + (5+1)
57= 7*7 + (7+1)
kya sahi hai ya galat?