Math practice for 13 year olds - page 252 of 424
Number of problems found: 8479
- What 7723
What is 17% of 30% of 500? - Eight years ago
The son asks his father how old he is. My father said: I will have twice as much as I had eight years ago in ten years. - Minutes 7720
Miloš goes to school on roller skates at a speed of 18 km/h. The journey takes 15 minutes. What speed does he have to go if he wants to be at school 5 minutes earlier? - Two thirds
Two-thirds of the unknown number is 8/7. What is 7/3 of this number? - Distance 7717
To what height does a 6.5 m long ladder leaning against a wall at a distance of 5.4 m reach? - Proportion of the continents
The area of Asia and Africa is 8:7, and the area of Europe and Africa is 5:6. In what proportion are the sizes of regions of Asia, Africa, and Europe? - Bottle
A company wants to produce a bottle with a capacity of 1.25 liters. Find the dimensions of a cylinder that will be required to produce this 1.25 liters if the height of the cylinder must be five times the radius. - Bucket 7714
A full bucket of water weighs 10kg. Half weighs 5.5 kg. How much does a bucket weigh? - Precisely 7713
There are only red and white marbles in the bag, and precisely 18% of the marbles in the bag are red. After removing 25 white balls, exactly 20% of the balls in the bag will be red. How many balls are there? Thank you very much for your help - Perpendicular 7712
Calculate the length of the shadow of a ladder 8 m long leaning against a 6 m high wall. (the sun shines perpendicular to the ladder - see picture). - Sales off
The price has decreased by 20%. How many percents do I have to raise the new price to be the same as before the cut? - Construction 7709
Two construction companies are working on the landscaping. The first would do the whole job in 12 days, the second in 20 days. How long will they work together if the first start working when the second has already worked 4 days? - One-third 7708
One-third of the pupils go to school by bus. The other half take a tram, and the remaining ten pupils walk. How many students are in the class? - Area to perimeter
Calculate the circle circumference if its area is 254.34cm2 - Regular triangular pyramid
Calculate the volume and surface area of the regular triangular pyramid. The height of the pyramid is 12 centimeters. The bottom edge is 4 centimeters, and the height of the sidewall is 12 centimeters. - Quadrangular pyramid
The regular quadrangular pyramid has a base length of 6 cm and a side edge length of 9 centimeters. Calculate its volume and surface area. - Destination 7703
The glider took off from the airport at 10:00 a.m. and flew to the designated destination 102 km away at a speed of 80 km/h. Half an hour later, a motorplane took off behind him at a speed of 180 km/h. When does the motor plane catch up with the glider, a - Acid evaporation
How many kilograms of water do we have to evaporate from 100 kg of 32% acid to make it 80% concentration? - Hay bags
Four cows eat 16 hay bags in 5 days. How many bags will eat five cows in 7 days? - Off-road 7696
The off-road car will travel 100 km with 10.5 liters. How many km will 116 liters cover?
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