Ques:- if a number is choosen between 100 and 999 includeing these numberrs what is the provbabilty that the number selected does not contain a 7 is
Recent Answer : Added by Admin On 2020-05-17 11:59:52:
p = prob(1st digit not 7)*prob(2nd digit not 7)*prob(3rd
digit not 7)
=(8/9)*(9/10)*(9/10)
=0.72
Sandhya had it right except that there are 900 numbers
between 100 and 999 inclusive (not 899).
Ques:- A son and father goes for boating in river upstream . After rowing for 1 mile son notices the hat of his father falling in the river. After 5 min. he tells his father that his hat has fallen. So they turn around and are able to pick the hat at the point from where they began boating after 5 min. Find out the speed of river.
Recent Answer : Added by Admin On 2020-05-17 11:59:48:
6 miles per hour…….
actually hat fell when they were 1 mile away from starting
and total time hat takes to travel to the starting point is
10 minutes ( 5 + 5 ).so, 1 miles per 10 minutes thats why 6
miles per hour
Ques:- What popular journal did C. V. Riley and B. D. Walsh begin in 1868?
Ques:- 2 men are walking towards each other at constant speeds.A train starting at one end crosses the first man in 18 seconds. After 10 minutes it meets the other man and crosses him in 12 seconds.(i am not sure of the values).Find the time when the 2 …
Ques:- Rahim bought 65 books for Rs.1150 from one shop and 50 books for Rs.920 from another. What is the average price he paid per book ?
Recent Answer : Added by Aravindhan On 2021-08-18 16:21:10:
Ques:- The number that does not have a reciprocal is?
Recent Answer : Added by Admin On 2022-09-29 17:45:34:
The rational number that does not have a reciprocal 0 because reciprocal of 0 is undefined.
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Ques:- Find out the C.I on Rs.5000 at 4% p.a. compound half-yearly for 1 1/2 years.
Recent Answer : Added by DK BOSS On 2021-07-15 09:06:35:
answer is 306.04
Ques:- If HEATER is written as KBDQHO, how will you encode COOLER ?
Recent Answer : Added by Sabari B On 2022-09-02 17:03:40:
FLRIHO=cooler
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Ques:- 1) In a club there are certain no. of males and females. If 15 females are absent then no. of males will be twice that of females. If 45 males are absent then female strength will be 5 times that of males. Find no. of males actually present.
Recent Answer : Added by Admin On 2020-05-17 12:01:55:
Let the number of males be given the name M.
Let the number of females be given the name F.
If 15 females are absent, then M will be twice that of
present females.
This means that M = 2 * (F – 15)
M = 2 * F – 30.
or 2 * F – M = 30.
Now if in addition to the 15 females being absent, we also
have 45 males being absent,
then this gives the equation,
(F – 15) = 5 * (M – 45)
which simplifies to
F – 15 = 5 * M – 225
5 * M – F = 210
Pulling the equations together, we get
5 * M – F = 210
-M + 2 * F = 30
Multiply the first equation by 2, and keep the second
equation as is.
10 * M – 2 * F = 420
– M + 2 * F = 30
Add the equations.
9 * M = 450
M = 50
Verify answer.
Calculate F
from – M + 2 * F = 30
-50 + 2 * F = 30
2 * F = 30 + 50
F = 40.
If 15 females are absent, then number of males will be twice
that of females.
40 – 15 = 25.
50 = 2 * 25. Confirmed.
If also 45 males were absent, then female strength would be
5 times that of males.
Female strength is 25 due to the 15 females being absent.
50 – 45 = 5.
25 = 5 * 5. Confirmed.
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Ques:- A farmer walks at constant speed on the perimeter of his rectangular field. it takes him twice the time to cover longer side than shorter side.if he walks total 300 m . then find out the area of field?
Recent Answer : Added by Jean Merde On 2022-05-17 08:55:52:
2x+x+2x+x = 300m
6x = 300
x = 300/6 = 50m
50m x 100m = 5,000 m2
Ques:- A right circular cylinder and a cone are there. Base radius of cone is equal to radius of cylinder. What is the ratio of height to slant side if their volume are the same?
Recent Answer : Added by Admin On 2020-05-17 12:01:55:
underroot(1-r^2)/3
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Ques:- A certain street has 1000 buildings. A sign-maker is contracted to number the houses from 1 to 1000. How many zeroes will he need?
Recent Answer : Added by Admin On 2020-05-17 12:00:37:
p = prob(1st digit not 7)*prob(2nd digit not 7)*prob(3rd
digit not 7)
=(8/9)*(9/10)*(9/10)
=0.72
Sandhya had it right except that there are 900 numbers
between 100 and 999 inclusive (not 899).