Math practice for 13 year olds - page 331 of 422

Number of problems found: 8437

ATC camp
The owner of the campsite offers 79 places in 22 cabins. How many of them are triple and quadruple?
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 one quarter of an unknown number to itself, we get 210. Find the unknown number.
Resistance
Determine the bulb's resistance with the current 200 mA and is in a regular lamp (230 V).
Sides of triangle
A triangle has a perimeter of 42 cm. Side a is half the length of side b, and side c is 2 cm longer than side a. Find the lengths of the sides of a triangle.
Four friends
Four friends shared the money. Vince got 1/4 of the total amount. Tony received 1/3 of the rest of the money, Joe got a half from the second residue, and George was left with 80. How much money did they have altogether?
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 it take to complete the contract?
Shaft drainage time
The mine foreman calculated that 2 pumps must be in operation for 17.5 hours to drain the shaft. 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.
Catching up time
Johnny 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 Johnny?
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 10 m, 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.
Canister
Gasoline is stored in a cuboid canister having dimensions 44.5 cm, 30 cm, and 16 cm. What is the total weight of a full canister when one cubic meter of gasoline weighs 710 kg, and the weight of an empty canister is 1.5 kg?

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