Math practice for 13 year olds - page 286 of 420

Number of problems found: 8399

The appliance
The appliance has a power input of 2.3 kW. It is connected to the mains voltage of 230 V. What is the current flowing through the appliance?
Water tank
A 288 hectoliter of water was poured into the tank with dimensions of 12 m and, 6 m bottom, and 2 m depth. What part of the volume of the tank water is occupied? Calculate the surface of the tank wetted with water.
Eva and
Eva and Jana have a total of 560 CZK. Eva has a third more than Jana. How much CZK does each have?
Turners
Two turners perform joint work in 3 hours. The first-turner would perform the job himself in 7 hours. How long would the same job last for a second-turner if he worked alone?
Cinema tickets
Cinema sold 180 tickets this Thursday, which is 20%. Monday 14%, Tuesday 6%, Wednesday 9%, Friday 24%, Saturday 12%, and Sunday 15%. How many tickets were sold per week?
Number Increased Percent
The number z increased by 20, which is 40% larger than the number z. Determine the number z.
Grade Percentage Better
There were 21 pupils in the class. The teacher gave grade 1 to 3 pupils, grade 2 to 5 pupils, grade 3 to 8 pupils, grade 4 to 4 pupils, and grade 5 to 1 pupil. What percentage of students received a grade better than 3?
Rectangle area
The length of a rectangle is x units, and the width is y. Dimensions are increased by 10% and 15%, respectively. What is the ratio of the areas of the old and new rectangle?
Mixture 2
How many liters of water must be added to 7 liters of a 20% solution to obtain a 10% solution?
Sharing Money Equally
Adam, Cyril, and Boris have a total of 102 CZK. How many crowns does Adam have, how many Boris and how many Cyril, if all three have the same when: a) Adam gives three crowns to Cyril b) Boris will give half of his money to Cyril c) Adam will give a third
The coil
How many ropes (a diameter of 8 mm) fit on the coil (threads are wrapped close together)? The coil has the following dimensions: The inner diameter is 400 mm. The outside diameter is 800 mm. The length of the coil is 470 mm.
Mug in Cube Box
A cylindrical mug is packed in a 1-liter cube paper box. The mug is in close contact with all the walls of the cube. What volume is my mug?
The parallelogram
The perimeter of the parallelogram is 79.5 m, and its shorter side is half the longer side. What is the length of each side of the parallelogram?
Glass Waste Container Hole
The round hole of the glass waste container has a diameter of 18 cm. Will a four-liter glass pass through this hole? If there are 4 liters of water in the glass, it reaches a height of 20 cm.
Vacation tour price
Boris and Brandon were on vacation by the sea with their parents. The stay cost the whole family 2170 euros. The trip price for a child was 115 euros lower than an adult's. Both boys took advantage of this discount this year. What was the price of the tou
Divide Number Ratio Three
Divide the number 600 by the ratio of 9:10:11
Bus time
The bus runs 6 km in 9 minutes. How many minutes will the bus go to a place 42 km away if it doesn't stop along the way?
Map Distance in Centimeters
How many cm on a map with a scale of 1:150,000 will two cities be separated when their distance is 30 km?
Block-shaped tank
The block-shaped tank has dimensions of 320 cm, 50 cm, and 180 cm. 1. How much water can fit in it? 2. It was 45% filled. How much water was in it?
Cinema Tickets Price Difference
Three cinema tickets are 24 € cheaper than seven tickets. How many cinema tickets can we buy if we have € 32?

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