X be the rate of interest for first four years
Total interest =180 rs
(360*x*4)/100+(360*5*6)/100 =180
find x
x=5%
@swapnil4ever2u said:how many distinct rectangles of perimeter not more than 258 cm can have both length and breadth as positive integers when expressed in cms ??
is it 128?
@somnathbhatta said:present ages: father = x , son = y if the father was as old as his son is now , say a yrs ago .then , x-a=y ... (i) and x-a = (y-a) ... (ii)solving , we find a = 4y -x put the value of a in eqn (i)x/y=7/4 or in this case y/x = 4/7
bro please explain the bold part
@TootaHuaDil said:The sum of the present ages of a father and his son is 99 years. When the father was as old as hisson is now, his age was four times the age of the son at that time. The ratio of the present ages ofthe son and the father is???? @The_Loser ye bna do
1st eq quite easy.
F + S = 99---- (1)
problem is with 2nd eqation.
this S = 4[ 2S - F] ---- (2)
F = 7S/4
Now how come this 2nd equation??
lets take an example of 25 & 20 ( father & son's age)
ques says When the father was as old as his son is now
so father's age = 20
to find son's age at that time
{20 - (25-20)}
we simply subtracted {S -(F-S)} = 2S - F
from here F = 7S/4
Put that in eq 1
F/S = 7/ 4
@bs0409 said:At a party some couples were invited.Out of them only 23 couples were having one child per couple with them.When I observed it I found 13 men were without any children and 20 women were also without any children.It is known that only couples are allowed to attend the party.Total number of couples at the party werea.28b.30c.33d cbd
is OA 28 ?
@TootaHuaDil said:The sum of the present ages of a father and his son is 99 years. When the father was as old as hisson is now, his age was four times the age of the son at that time. The ratio of the present ages ofthe son and the father is???? @The_Loser ye bna do
4:7?
x = father's present age
y = son's present age
y = son's present age
x + y = 99
x - T = y
(x - T) = 4(y - T)
y = 4y - 4T
4T = 3y
y = 4T/3
so x = 7T/3
so ratio ----> x/y = 7T/3/4T/3 = 7/4 or 4/7
x - T = y
(x - T) = 4(y - T)
y = 4y - 4T
4T = 3y
y = 4T/3
so x = 7T/3
so ratio ----> x/y = 7T/3/4T/3 = 7/4 or 4/7
@raopradeep said:is it 128?
hey even i m also gettin it 128 but dnt u thnk they are askin abt less than 258 so we have to take aalll cases less than 258 i thnk so
@hatemonger bhai last 5 yrs k liye pehle k 4yrs ka amount nahi lena hai ? i mean u took the initial principle for the last 5 yrs too. a bit confused. but don't we have to change the principle for the last 5 yrs ?
@ishu1991 said:hey even i m also gettin it 128 but dnt u thnk they are askin abt less than 258 so we have to take aalll cases less than 258 i thnk so
PLZ POST BY YOUR METHOD HOW 258 IS POSSIBLE?
Harsha makes a fixed deposit of Rs 20000 with the bank of india for a period of 3 years .If the rate of interest be 13% SI per annum charged half yearly ,what amount will he get after 42 months??
@mailtoankit said:4:7?x = father's present agey = son's present agex + y = 99x - T = y(x - T) = 4(y - T)y = 4y - 4T
Thanks
ok. i thought that when the rate of interest changes we need to change the principle for the 2nd term ..
@hatemonger Harsha makes a fixed deposit of Rs 20000 with the bank of india for a period of 3 years .If the rate of interest be 13% SI per annum charged half yearly ,what amount will he get after 42 months??
Did you get this one??