Tag: math & puzzles

Thirty men take 20 days to complete a job working 9 hours a day.How many hour a day should 40 men work to complete the job?

It is a 5 digit number.If we put the numeral 1 at the beginning, we get a number three times smaller than if we put the numeral 1 at the end of the number

2,6,12,20,xValue of x?

Using the digits 1 up to 9, two numbers must be made. The product of these two numbers should be as large as possible. All digits must be used exactly once. The Question: Which are the requested two numbers?

Three friends Pablo, Edvard, and Henri are talking to each other about the art collection of Leonardo. Pablo says: "Leonardo has at least four paintings of Rembrandt." Edvard says: "No, he has less than four paintings of Rembrandt." "According me," says Henri, "Leonardo has at least one Rembrandt." The Question: If you known that only one of the three friends is right, how many Rembrandts does Leonardo possess?

Richard is a strange liar. He lies on six days of the week, but on the seventh day he always tells the truth. He made the following statements on three successive days: Day 1: "I lie on Monday and Tuesday." Day 2: "Today, it's Thursday, Saturday, or Sunday." Day 3: "I lie on Wednesday and Friday." The Question: On which day does Richard tell the truth?

On an early morning, three rivals get together on an open spot in a dark wood to compose a quarrel by means of guns. A kind of duel, but with three persons: A, B and C. The rules of the game are: They draw lots who may fire first, second and third. Next, they will continue firing at each other in this order until only a single person is alive. Every person decides himself at which person he fires. Everyone knows that A hits (kills) in 100% of all shots, B hits (kills) in 80% of all shots and C hits (kills) in 50% of all shots. Each person chooses his ideal strategy. No one is killed by a stray bullet. The Question: Who has the largest chance of surviving the truel, and how big is this chance?

A does a work in 15 hrs .B is 60% more efficient than a .how much time will B take to complete the work?

In a circular track of 100 kms run A and B.A's speed is 25km/hr and B's is 15km/hr.In hw much time will they cross each other for the 3rd time?

In a race of 100 meters A beat B by 5 meters. In another similar race B beat C by 5 meters.So by how much distance will A beat C in a 100 meter race?