Math practice for 13 year olds - page 338 of 434
Number of problems found: 8666
- Tour
Thirty-five people went on a tour and paid 8530. Employees pay 165, and family members pay 310. How many employees and how many family members went on the tour? - Schools
Six hundred seventy-eight pupils attend three schools. The first had 21 students, and the third had 108 fewer students than the second school. How many students attend the schools? - Summerjob Three students participated in the summer job. Together, they earned 1780, -. Peter got a third less than John, and Paul got 100 more than Peter. How much did each one of them cost?
- UN 1 If we add to an unknown number, it's a quarter, and we get 210. Find an unknown number.
- Resistance
Determine the bulb's resistance with the current 200 mA and is in a regular lamp (230V). - Sides of triangle
Triangle has a circumference of 42 cm. Side a is two times shorter than side b, and side c is 2 cm longer than side a. Find the sizes of the sides of a triangle. - Cycling trip
At 8 AM start, a group of children from the camp started on a day cycling trip. After 9:00, the weather deteriorated sharply, and the leader decided to send for the children's bus on the same route, which started at 10 hours. For how long and at what dist
- Car and cyclist
The cyclist started from town at a speed of 18 km/h. After 1 hour 30 min started the car from town and caught up with the cyclist in 50 minutes. How fast was the car? - Four friends Four friends shared the money. Vasek got 1/4 of the total amount. Tonda received 1/3 of the rest of the money, Joe got a half from the second residue, and Jirka left 80. How much money get together?
- Diver and pressure
Determine the pressures exposed to a diver without a suit at a depth of 15 meters, with a small space suit at a depth of 25 meters, and a massive suit at 70 meters in water. - Ice cream
Annie likes ice cream. In the shop are six kinds of ice cream. How many ways can she buy ice cream in three scoops if each has a different flavor mound and the order of scoops doesn't matter? - Price increase 2x
If we increase the product's price twice by 20%, how much % is higher the final price than the original? - Contract
Eight employees complete the contract for 65 hours. After 17 hours, three employees had to leave for another job. How many more hours will the job on the contract be fulfilled? - Calculation 3620
The mine foreman calculated that 2 pumps must be in operation for 17.5 hours to drain the tunnel. He wanted to speed up the emptying of the shaft and added 3 more identical pumps. How long will it take to empty the shaft? Please also show your calculation - Pumps
Four identical pumps fill the tank in 40 hours. How many pumps would we have to use if we wanted to save 8 hours?
- Rhumbline
Find the circumference and area of the rhumbline ABCD if the short side AD has a length of 5 cm, and the heel of the height from D leading to the AB side divides the AB side into two sections of 3 cm and 4 cm. - Distance 3615
Honza left home at 8 a.m. on foot at an average speed of 4 km/h. At 11 a.m., dad followed him on a bicycle at an average speed of 40 km/h. How long and at what distance from home will dad catch up with Honza? - Master work
The master will complete the given task in 4 hours. When they're done together, how long will it take to master students entirely in three hours? - Horizontal Cylindrical Segment
How much fuel is in the horizontal cylindrical segment tank with a length of 10m, a width of level 1 meter, and a level of 0.2 meters below the tank's upper side? - Tetrahedral pyramid
It is given a regular tetrahedral pyramid with a base edge of 6 cm and a height of pyramid 10 cm. Calculate the length of its side edges.
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