average age of a group of 10 students is 20 years,if average age increased by two years when two new students are joined then the average age of two new students
a).84 b).64
c).32 d).42
6 Replies
ashish gupta
( student)
(1922 Points)
Replied 16 March 2012
i think 32 is the answer.
see 20*10 = 200
22*12 = 264
64/2= 32
intermediate(ipc)course
(no)
(1460 Points)
Replied 16 March 2012
the sum of the ages of 3 persons is 150 yrs .10yrs ago their ages were in the ratio 7:8:9.their present ages are
a).(45,50,55) b).(40,60,50)
c).(35,45,70) d).none.
Sanket
(!..Live to Give..!)
(16427 Points)
Replied 16 March 2012
Ten years ago, their ages were in the ratio 7:8:9, so you can assume their ages 10 years ago to be 7x, 8x and 9x respectively.
As of now, their ages would be 7x + 10, 8x + 10 and 9x + 10
The sum of these ages is 150, so:
7x + 10 + 8x + 10 + 9x + 10 = 150
or, 24x + 30 = 150
or, 24x = 150 - 30 = 120
or, x = 120/24 = 5
So their present ages are 7*5 + 10, 8*5 + 10 and 9*5 + 10
i.e. 45, 50 and 55 (a)
intermediate(ipc)course
(no)
(1460 Points)
Replied 16 March 2012
thanks.........................................................
intermediate(ipc)course
(no)
(1460 Points)
Replied 16 March 2012
if x is inversely related with square of y for x =1 & y=2 then find the value of x when y=6 :
a).3 b).9
c).1/3 d).1/9
Recent Topics
- NRO Interest - Taxed at source and in Foreign Coun
- Clarity needed on effective date
- Income Tax Refund Deadline Shortened to Five Years
- Rectification Applications for Past GST Demands
- Where can I find a trusted provider to hire a skip
- GST Invoices Series
- FILING OF ITR AY 20-21
- CLAIMING OF U CLAIMED RCM
- Building construction works
- REGARDING GSTR-9 F.Y 2023-24
Related Threads
CAclubindia
