Math practice for 13 year olds - page 110 of 399

Number of problems found: 7966

Isosceles triangle angles
The angle at the base of an isosceles triangle is 18 ° larger than the angle at the central vertex. Calculate the size of the interior angles.
Grape mixture price
In the fruit warehouse, they have white grapes for CZK 70 per kilogram and blue grapes for CZK 90 per kilogram. For the retail chain, 600 kg of a mixture of both types must be prepared so that one kilogram of the mixture costs CZK 85. How many kilograms o
Clock dial angles
The triangle that connects on the dial: a) 2,7,9 b) 3,6,10 Calculate the size of the interior angles.
The temperature 31
The temperature last night was -11 °C; at noon today, it was 3 °C. What is the difference between the temperatures?
An isosceles trapezoid
An isosceles trapezoid has base angles of 50° each, and its bases are 20 cm and 30 cm. Compute its area.
Water - heat
Calculate the mass of water that gave off 520.5 kJ of heat when cooled from 69 °C to 27 °C.
Inspector ticket probability
There are 32 passengers on the bus, including three passengers who still need a valid ticket. After a while, an inspector got on the bus and started checking the tickets. What is the probability that he wanted to check the passenger's ticket without a tic
The temperature 30
The temperature in Hubby's office is 16 degrees Celsius, and the temperature outside his office is negative 7 degrees Celsius. What is the difference in temperature in these two places?
At 5:00
At 5:00 AM, the room temperature was 20 °C. After six hours, the reading was 28 °C. The temperature rose to how many degrees? What was the average change in temperature per hour?
Factory plan measurements
On the plan, the rectangular factory hall has dimensions of 30 cm and 16 cm at a scale of 1:500. Calculate the actual measurements.
Two alloys
Two alloys, Y and Z, are each made up of zinc, tin, and copper. In alloy Y, the ratio of zinc to tin is 2:5, and the ratio of copper to tin is 4:3. Find the ratio of copper:zinc:tin in alloy Y.
Beni has
Beni has a rectangular tub with a height of 50 cm, a width of 70 cm, and a length of 90 cm. He will fill the tub with water. The amount of water needed to fill 2/3 of Beni's tub is :
Shadows
At the park, a young woman who is 1.72 meters tall casts a 3.5 meters shadow at a certain hour. What is the height of a tree in the park that, at the same time, casts a 12.3 meters shadow?
Tower roof
The tower's roof is a regular 4-sided pyramid with a height of 4 m and an edge of the base of 6 m. 25% of the roof covering was found to be damaged. How many square meters of coverage are needed to repair the roof?
Dividing money
The father originally wanted to divide the financial amount between his sons in the ratio of 7:6. However, he then split it at 6:5 (in the same order). One of the sons got angry that he should have received 120 euros more. How many euros did each son rece
Poster ratio reduction
I will reduce the poster with sides of 2.4 m and 1.6 m in a ratio of 3:8. What are its new dimensions?
Add quarter to a number
What is the total of 80 plus 1/4 of 120?
Box wrapping paper
Mother and daughter Susan are wrapping presents for father. Matt has a cube-shaped box with dimensions of 9 cm, 3 cm, and 7 cm, and Susan has a box in the shape of a cube with an edge length of 3 cm. How many square cm of wrapping paper will they use in t
Triangle side possibilities
Which three lines of a given length can be three sides of a triangle? A / 42 mm; 22 mm; 12 mm; B / 5 cm, 50 mm, 6 cm; C / 10 m, 5 m, 50 dm; D / 2.1 cm, 4.2 cm, 1.9 cm
Prism grid sketch
Sketch a grid of a quadrilateral prism with a rectangle of 1 cm x 3 cm and a height of 5 cm.

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