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Aptitude Question: A student sent 120 emails in 5 days. Each day....
#1
Aptitude Question: Can be useful for various competitive exams including GATE BT.

A student sent 120 emails in 5 days for getting a PhD position. Each day he/she sent 5 mails more than the previous day. How many emails did he/she send on day 1?


Answer will be shared soon. Till then share your answer and how to approach this problem.
Sunil Nagpal
MS(Research) Scholar, IIT Delhi (Alumnus)
Advisor for the Biotech Students portal (BiotechStudents.com)
Computational Researcher in BioSciences at a leading MNC


Suggested Reads:
Top Biotech Companies | Top places to work
Indian Biotech Companies and Job Openings
Aiming a PhD in Top Grad School? | These are the Important Points to Consider
Careers in Biotechnology | A list of various Options
Biotechnology Competitive Exams in India
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#2
(02-04-2017, 10:01 PM)SunilNagpal Wrote: Aptitude Question: Can be useful for various competitive exams including GATE BT.

A student sent 120 emails in 5 days for getting a PhD position. Each day he/she sent 5 mails more than the previous day. How many emails did he/she send on day 1?


Answer will be shared soon. Till then share your answer and how to approach this problem.
14 emails on first day
14+19+24+29+34=120 emails in five days
Regards ,
Lavkesh Sharma

[+] 1 user Likes Lavkeshsharma's post
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#3
Approach? What if someone asks for 12000 mails in 50 days? With the trend of 10 mails more than previous day. It's always good to have a universal approach..
Right answer though! Well done
Sunil Nagpal
MS(Research) Scholar, IIT Delhi (Alumnus)
Advisor for the Biotech Students portal (BiotechStudents.com)
Computational Researcher in BioSciences at a leading MNC


Suggested Reads:
Top Biotech Companies | Top places to work
Indian Biotech Companies and Job Openings
Aiming a PhD in Top Grad School? | These are the Important Points to Consider
Careers in Biotechnology | A list of various Options
Biotechnology Competitive Exams in India
[+] 2 users Like SunilNagpal's post
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#4
Let total no.of mails = 't'
Mails sent on first day = 'x'
No.of mails sent more than the previous = 'k'
No.of days, mails were sent ='n'

nth term = 'x+(n-1)k'
Sum of n terms totals down to total no.of mails sent i.e 't'
t = (x)+(x+k)+(x+2k)+(x+3k)+...+(x+(n-1)k)
t = (nx )+ k.n.(n-1)/2

12000 = 50x + 10.50.49/2
12000 = 50x + 12250
50x = 250
x = 5
[+] 4 users Like Raj Mohan's post
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#5
(02-07-2017, 04:44 PM)Raj Mohan Wrote: Let total no.of mails =  't'
Mails sent on first day  = 'x'
No.of mails sent more than the previous = 'k'
No.of days, mails were sent  ='n'

nth term = 'x+(n-1)k'
Sum of n terms  totals down to total no.of mails sent i.e 't'
t = (x)+(x+k)+(x+2k)+(x+3k)+...+(x+(n-1)k)
t = (nx )+ k.n.(n-1)/2

12000 = 50x + 10.50.49/2
12000 = 50x + 12250
    50x = 250
        x = 5

Thanks Raj for the structured and universal approach!
Sunil Nagpal
MS(Research) Scholar, IIT Delhi (Alumnus)
Advisor for the Biotech Students portal (BiotechStudents.com)
Computational Researcher in BioSciences at a leading MNC


Suggested Reads:
Top Biotech Companies | Top places to work
Indian Biotech Companies and Job Openings
Aiming a PhD in Top Grad School? | These are the Important Points to Consider
Careers in Biotechnology | A list of various Options
Biotechnology Competitive Exams in India
Like Post Reply
#6
(02-07-2017, 04:44 PM)Raj Mohan Wrote: Let total no.of mails = 't'
Mails sent on first day = 'x'
No.of mails sent more than the previous = 'k'
No.of days, mails were sent ='n'

nth term = 'x+(n-1)k'
Sum of n terms totals down to total no.of mails sent i.e 't'
t = (x)+(x+k)+(x+2k)+(x+3k)+...+(x+(n-1)k)
t = (nx )+ k.n.(n-1)/2

12000 = 50x + 10.50.49/2
12000 = 50x + 12250
50x = 250
x = 5

Super approach
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#7
Good evening sir,
Sunil sir I want to ask u some suggestion.
Sir I am persuing my MSc.Biotechnology 3 rd sem and I have completed my bachelors in BSc.Agril.Biotechnology(4yrs course).and now I want to go for QA/QC sector in biotechnology, for that could u please guide me how to apply for this or in what way I have to prepare/elligible myself for it.
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