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Dikesh Kumar Gumansingh 11 years ago

If a + b + c = 0, then (a3 + b3 + c3) ÷ abc is equal to:

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Dikesh Kumar Gumansingh 11 years ago

The ratio between the third proportional of 12 and 30 and mean proportional of 9 and 25 is:

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kiranmai patha 11 years ago

3rd proportional of 12 and 30 is
12 : 30 = 30 : x
x=75
mean proportional of 9 and 25 is sqrt (9*25) ie 15
ratio = 75 : 15 i.e., 5 : 1

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Dikesh Kumar Gumansingh 11 years ago

A rectangular room measures 7.5 meters in length and 3 meters in width. The room has a height of 3 meters. A spider sits 25 centimeters down from the ceiling at the middle of one of the short walls. A sleeping fly sits 25 centimeters up from the floor at the middle of the opposite wall. The spider wants to walk (i.e., move along the walls, floor, and ceiling only) to the fly to catch it. How can the spider reach the fly, walking just 10 meters? Is it even possible?

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Dikesh Kumar Gumansingh 11 years ago

I have a box of one hour fuses. If I set one end of a fuse on fire, I know that the fuse will burn all the way to the other end in EXACTLY one hour. However, the fuses may burn unevenly [ie - it may take 59 minutes to burn the first half of a fuse, but only 1 minute to burn the other half]. Furthermore, all of the fuses may burn unevenly at a different rate. The only thing we know for sure is that each one takes 1 HOUR to burn completely. The Question: Given 2 of these fuses and a lighter, how can I time out 45 minutes precisely?

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Dikesh Kumar Gumansingh 11 years ago

There is a building of 100 floors If an egg drops from the Nth floor or above it will break If it’s dropped from any floor below, it will not break You’re given 2 eggs Find N, while minimizing the number of drops for the worst case.

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Dikesh Kumar Gumansingh 11 years ago

Two MIT math grads bump into each other while shopping. They haven't seen each other in over 20 years. First grad to the second: "How have you been?"
Second: "Great! I got married and I have three daughters now."
First: "Really? How old are they?"
Second: "Well, the product of their ages is 72, and the sum of their ages is the same as the number on that building over there..."
First: "Right, ok... Oh wait... Hmm, I still don't know."
Second: "Oh sorry, the oldest one just started to play the piano."
First: "Wonderful! My oldest is the same age!"
How old was the first grad’s daughter?

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K.Sailja 11 years ago

send answer with your explanation

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Dikesh Kumar Gumansingh 11 years ago

given three daughters age multipication 72
so possible cases are
1 1 72 addition=74
1 2 36 addition=39
1 3 24 addition=28
1 4 18 addition=23
1 6 12 addition=19
1 8 9 addition=18
2 2 18 addition=22
2 3 12 addition=17
2 4 9 addition=15
2 6 6 addition=14
3 3 8 addition=14
3 4 6 addition=13
and the other man was unable to answer when compared to the building

so he must be confused
as a MIT grad can not be that weak in math

so there are two possible cases 338 and 266 where the sum is 14 ...........

again there can not be twins as hid old daughter bcoz he mentioned to have "the oldest one" in piano phrase so answer is 3 3 8

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Dikesh Kumar Gumansingh 11 years ago

A man has two cubes at his desk. Every day he arranges both cubes so that the front faces show the current day of the month. What numbers are on the faces of the cubes to allow this?

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Devasish Raj 11 years ago

in the first cube numbers are from 0,1,2,3,4,5
and in the second cube numbers are 6,7,8,9,1,2

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Dikesh Kumar Gumansingh 11 years ago

@DEVASISH RAJ how can he do 04,05

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Dikesh Kumar Gumansingh 11 years ago

There are 25 horses in a racing competition. You can have race among 5 horses in a particular race. What would be the minimum number of races that will be required to determine the 1st, 2nd and 3rd fastest horses?

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ganesh babu 11 years ago

5 races by time (or) 6 races

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Dikesh Kumar Gumansingh 11 years ago

A train travelling 20 km on stopped at station for 3 mins. then increased speed by 10kmph to reach the destination what would be its speed increased by if it stopped 5mins in that station?

plz..answer

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sudhakar 11 years ago

3min stopped, speed increase as 10kmph

if 1min stopped speed increase as 3.33

Then for 5min stopped the speed increase as (3.33*5)=15kmph

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