Math practice for 13 year olds - page 102 of 421
Number of problems found: 8406
- Unknown 73244
75 per mille of an unknown number equals 60. What is an unknown number? - A flagpole
A flagpole is leaning at an angle of 107° with the ground. A string fastened to the top of the flagpole is holding up the pole. The string makes an angle of 38° with the ground, and the flagpole is 8 m long. What is the length of the string? - Identical 73194
Three identical pumps fill 50,400 liters of diesel into the tank in 7 hours. How much more (less) diesel will they pump if we add two more pumps, and they will all work for 4 hours? - Seed drills
The tractor driver connected two seed drills behind the tractor and sowed 7 ha of grain in 5 hours. How many hectares did he plant in 8 hours the next day if he connected three seed drills? - 20 balls
20 colored balls in a bag: Four red Seven green Nine yellow What is the probability of picking a yellow ball? - Distance 73124
The map shows the cities of Beijing and Tokyo at a distance of 5.1 cm. Their actual air distance is 2040 km. What is the scale of the map? - Four-digit 73114 How many four-digit numbers can we assemble from the digits 2, 6, 3, 5, 1, and 9 if the numerals in the number cannot be repeated?
- T-shirts 73074
Dušan has 8 T-shirts and three pairs of shorts in his closet. How many ways can he dress for school? - A person
A person buys 10 kg of commodity A at a rate of 2 kg per dollar, 20 kg of commodity b at a rate of 5 kilograms per dollar, and 30 kg of commodity C at a rate of 10 kg per dollar. Find the average price of kg per dollar. - Divide line segment
Find the point P on line segment AB, such that |AP| = r |AB|. Coordinates of endpoints: A = (−2, 0, 1), B = (10, 8, 5), ratio r = 1/4. - Calculate 73024
Calculate the permille descent of the railway line in the section of 7.2 km by 21.6 m. - Calculate 72994
Calculate 50 per mille of 340. - Aluminum 72964
The aluminum disc has a diameter of 96 mm. 10 discs are cut from a sheet metal sheet 1 m long and 10 cm wide. What% is waste? - American stars
Some movie stars are very well paid. Actor Leonardo DiCaprio received a fee of 20 million US dollars for the main role in the film. In this film, which lasts 125 minutes, there is also a short scene in which DiCaprio takes 6 seconds to put on his boots. H - Cats and birds
There are 15 cats and birds in the park. There are 42 legs altogether. How many cats are there? - Relay 2
Marco Racer's best time in the 100-yard relay is 15 1/4 seconds. How many seconds would it take him to run 450 yards at the same rate? - Magazine's 72894
Shop reduced the magazine price by as many percent as the euro cost the magazine before the price reduction. Find the original price if it costs 16 euros after the discount. - Unknown 72884
The square root of an unknown number equals the square of 2. What is the unknown number? - A chord
In a circle radius of 6 cm, a chord is drawn 3 cm from the center. Calculate the angle subtended by the chord at the center of the circle. Hence find the length of the minor arc cut off by the chord. - A man 6
A man wants to get the best deal on gasoline. He travels out of his way to buy a gallon of gas for $2.14, but he has to travel farther for that gas, or he could travel a shorter distance for a gas price of $2.26. If he put 15.7 gallons of gas, what is the
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