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.
02-05-2017, 12:37 AM
(This post was last modified: 02-05-2017, 12:39 AM by SunilNagpal.)
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
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
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.