Veto q&a 7 Month22 (1)

2018
May
Q & A
@hangout
PaGeS aRe eaTen BY TeRmiTeS
ToTal
PluS
Syam ayyampara
Q
Q
Q
The cost of a machine is estimated to be increasing
at the rate of 10% every year. If it costs Rs.12000
now, what will be the estimated value after 3
years?
Cost of the machine = 12000
Increasing the rate = 10%
Estimated value of machine after 3 years
110 110 110
= 12000 × × × = 15972
100 100 100
In a certain time Rs.1200 becomes Rs.1560 at
10% per annum simple interest. Find the principle
amount that will became Rs. 2232 at 8% simple
interest per annum in the same time?
Given A=1560
P = 1200
I = 1560-1200=360
PNR
R = 10% I = 100
New, given A = 2232,
R=8%, N=3 years
I × 100 360 × 100 36
N= = = = 3
P× R 1200 × 10 12
then, ⎛ RN ⎞ ⎛ 8×
3⎞
P⎜1+ ⎟= 4; P⎜1+ ⎟=
2232
⎝ 100 ⎠ ⎝ 100 ⎠
124
P × = 2232
100
2232×
100
P= = 1800
124
The difference between compound interest and
simple interests for an amount in 2 years is Rs.32.
If the rate of interest is 8%. The amount is?
Difference between simple interest and compound
interest
⎛ R ⎞
=P⎜
⎟ = D
⎝100
⎠
2
2
⎛ 8 ⎞
8×
8
32 = P ⎜ ⎟ 32 = P ×
⎝100 ⎠ 100 × 100
Q
Q
Q
Q
32× 100 × 100
P =
= 5000
8×
8
There are 30 students in a class. One student
weighing 25 kg goes away and a new student joins
the class. If the average weight is then increased
by 200gm, what is the weight of the new student?
The weight of the new student = Weight of leaving
student + (total students x increasing weight)
⎛ 200 ⎞
= 25 + ⎜30 × ⎟= 25+6 = 31kg
⎝ 1000 ⎠
A train 220 m long is running at 30km/hr. How long
will it take to cross a bridge which is 80m long?
Length of train = 220m
5 25
Speed = 30km/hr = 30 × m / s = m / s
18 3
Length of bridge = 80m
Time =
length of train + length of bridge
Speed of the train
220 + 80
= = 36sec
25
3
Find the time taken by a 180m long train running at
54 km/hr to cross a man standing on a platform?
Length of train = 180 m
5
= 54 × / = 15 /
18 m s m s
distance
Time = = 180
Speed 15 = 12 Sec
A train of length 100m runs at a speed of 120 km/
hr from North to South. Another train of length 150
m travels with a speed of 80 km/hr from South to
North. What is the time required to cross each
other?
Length of the train from North to South = 100m
Speed of the train from the North to South = 120
km/hr
Length of the train from South to North = 150 m
Speed of the train from South to North = 80km/hr
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