Math Puzzles | Page 33 of 56

Grandson about as many days as son is weeks riddle

My grandson is about as many days as my son is weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 140 years.

Can you tell me my age in years?

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Car selling in silent auction puzzle

You are hosting a silent auction to sell your antique car.
The rules are:
(1) prospective buyers bid for your car by placing their bids in sealed envelopes,
(2) then after collecting all bids, you sell the car to the highest bidder for the price that he bid.

This may seem like a reasonable way to conduct a silent auction, but there is a risk involved for you, the seller. If your car is highly valuable, but all buyers think they are the only ones who recognize that it is, they may actually make bids that are LESS than they think the car is actually worth. As a result, your bids will be lower, and you suffer.

Now, You are given an opportunity to make change in rule for the silent auction that will induce people to bid what they think an object is truly worth? What rule will you be applying in conducting the bid, so that you’ll not suffer loss and buyer will bid as per the true worth? car-selling-silent-auction-puzzle

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2 Cars and bird between them logical math puzzle

There is a circular race-track of diameter 1 km. Two cars A and B are standing on the track diametrically opposite to each other. They are both facing in the clockwise direction.
At time t=0,
both cars start moving at a constant acceleration of 0.1 m/s/s (initial velocity zero). Since both of them are moving at same speed and acceleration and clockwise direction, they will always remain diametrically opposite to each other throughout their motion.

At the center of the race-track there is a bird.
At time t=0,
The bird starts to fly towards car A. When it reaches car A, it turn around and starts moving towards car B. When it reaches B, it again turns back and starts moving towards car A. It keeps repeating the entire cycle. The speed of the bird is 1 m/s throughout.

After 1 hour, all 3 bodies stop moving. What is the total distance traveled by the bird? $cars-and-bird-logic-math-puzzle$

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Software Developer bounty prize puzzle

20 Software bug were given a bounty and assigned to a software developer. For each bug resolution, the software developer was promised $10000. However, for every bug reported in his resolution, it was decided that he would have to give back $5000.
To win maximum bounty amount, the software developer gave resolution to all the 20 bugs. As a result, he got some bug reported in his resolution and got finally got $125000 at the end of the evaluation.

Can you calculate how many bugs were reported back in the resolutions? software-developer-bounty-prize-puzzle

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What is the age of grand father puzzle

A boy asks his father, “what is the age of grand father?“.
Father replied “He is x years old in x^2 years“,
and
also said, “we are talking about 20th century my son“.

What is the year of birth of grandfather? grandfather age puzzle

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Five pieces of chain to make a long chain riddle

You have five pieces of chain, each consisting of three links. You want to make one long chain of these five pieces. Breaking open a link costs 1 dollar, and welding an open link costs 3 dollars.

Is it possible to make one long chain of the five pieces, if you have just 15 dollars?
pieces of chain to make long chain riddle

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Numbers on a telephone’s number pad puzzle

What number do you get when you multiply all of the numbers on a telephone’s number pad?
telephone number pad puzzle

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Create correct mathematical expression

Replace the # symbols with mathematical operations (add, less, multiply or divide) such that the following becomes correct:

9 # 8 # 7 # 6 # 5 # 4 = 91

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The final war between India, Pakistan and srilanka

Pakistan, India and Srilanka are engaged in a missile war, such that they fire one after the other, in a sequence, the sequence selected by draw of lots. The rules of war are such that the 3 countries keep on shooting at each other until they hit with the missile. This goes on until there is one last country left unhit, and then the war ends.
The chances that