Math problems

From our database of math problems we offer:

• Tributaries
  The first tributary fill pool with water in 15 hours. The second tributary fill pool in 10 hours. For how many hours the pool is filled with both tributaries?
• Mirror
  How far must Paul place a mirror to see the top of the tower 12 m high? The height of Paul's eyes above the horizontal plane is 160 cm and Paul is from the tower distant 20 m.
• Florist's
  The florist got 72 white and 90 red roses. How many bouquets can bind from all these roses when each bouquets should have the same number of white and red roses?
• Magnification of the square
  If we increase the square side, increase the content of the 80 %. About what percentage was increased his sides?
• Geometric progression 2
  There is geometric sequence with a₁=5.7 and quotient q=-2.5. Calculate a₁₇.
• Basket of fruit
  In six baskets, the seller has fruit. In individual baskets, there are only apples or just pears with the following number of fruits: 5,6,12,14,23 and 29. "If I sell this basket," the salesman thinks, "then I will have just as many apples as a pear." Which
• Gon functions
  Decide which of the numbers (values ​​of trigonometric functions) are positive and which are negative (or zero). Positive mark +1 and negative -1.
• TV transmitter
  The volume of water in the rectangular swimming pool is 6998.4 hectoliters. The promotional leaflet states that if we wanted all the pool water to flow into a regular quadrangle with a base edge equal to the average depth of the pool, the prism would have.
• Weekly service
  In the class are 20 pupils. How many opportunities have the teacher if he wants choose two pupils randomly who will weeklies?
• Balls
  The boys changed stamps, beads and balls. For 9 balls is 3 stamps, 2 balls is 44 stamps. How many beads is for 1 ball?
• travel agency
  Small travel agency offers 5 different tours at honeymoon. What is the probability that the bride and groom choose the same tour (they choose independently)?
• Unknown number 11
  That number increased by three equals three times itself?
• Unknown numbers
  The sum of two consecutive natural numbers and their triple is 92. Find these numbers.
• Clock
  How long is trajectory of second hand of hours for day, if is 15 mm long?
• Variations 4/2
  Determine the number of items when the count of variations of fourth class without repeating is 600 times larger than the count of variations of second class without repetition.
• Three friends
  Divide 570 euros to three friends so that first will get 50 euros less than the second and third twice more than the first. How many euros will get everyone?
• Mom and daughter
  Mom is 30 years older than the daughter. What is the age difference between them in 35 years?
• Bridge
  The bridge arc has a span 235 m and height 3 m. Calculate the radius of the circle arc of this bridge.
• Rectangular trapezoid
  Calculate the content of a rectangular trapezoid with a right angle at the point A and if |AC| = 4 cm, |BC| = 3 cm and the diagonal AC is perpendicular to the side BC.
• Chocolate
  I have a box of chocolate - white, milk and dark. The ratio of white to milk with dark is 3: 4. The ratio of white and milk to dark is 17: 4. Calculate what is the ratio between white, milk, dark chocolate.