Maths practice for 12-year-olds - page 192 of 351

Number of problems found: 7018

Highway calculation
How many meters does a car travel on the highway at a speed of 130 km/h per second (use a simple proportion)?
Lunch
Lunch is given to seniors from 12:15 to 12:40 during the Coronavirus pandemic. What angle will the minute hand of the clock describe during this time?
Stream cleanup calculation
The scouts decided to clean up the stream outside the town. On the first day, they cleared half of the total length of the stream. On the second day, 2/7 of the entire length. On the third day, they cleared a third of what was left, and on the fourth day,
Grandma
6 kg of potatoes is enough for four people at home for 15 days. If Grandma visits, how many days will this amount be enough?
Triangle side length
The sizes of the sides of a triangle are three natural numbers. The two shorter sides have lengths a = 7 cm and b = 9 cm. What size will the third side be if we want the triangle to have the largest possible perimeter?
Pancake baking calculation
Mom baked pancakes and put them on a plate. After Mike had eaten three-sevenths of them, his brother Pete came and took three-quarters of the pancakes from the plate. In the end, Jane finished the remaining 7 pancakes. How many pancakes did mom bake?
Wood density calculation
Calculate the density of 2.5 tons of wood, knowing it takes up three cubic meters. Express the result in g / dm cubic.
Tank water remaining
They drained the water from the full tank through three holes. 1/6 of the tank volume flowed through the first hole, 2/5 of the volume through the second hole, and 1/4 of the volume through the third hole. The tank has the shape of a cuboid with dimension
Tank oil calculation
The tank is shaped like a block measuring 80 cm, 30 cm, and 20 cm. The oil level is 6 cm below the edge. Find the amount of oil in the tank in liters.
Cuboid surface calculation
We have a block with a square base and a height of 12 dm. We know that its volume is 588 cubic dm. Calculate the surface area of a cuboid with the same base but 2 cm more height. You write the result in dm².
Rotating cone
The rotating cone has a base diameter of 18 dm and a height of 12 dm. Calculate the volume V.
Strawberry harvest calculation
On the farm, twelve part-timers planned to harvest a crop of strawberries in 5 days. On the fifth day in the weather forecast, they reported rain. How many part-timers will they need to harvest the strawberries in four days?
Mom 6
Mom is throwing a party and buying cakes. Twice as many cakes for each adult as for each child. 1. What proportion of the cakes are for children if the number of adults at the party is twice as many as the number of children? 2. What proportion of the par
Surface - formula
Of the formula, S = the surface of the cuboid S=2. (ab+ac+bc) express unknown c. C =?
Tank water height
The block-shaped tank with bottom dimensions of 2.5 m and 2 m is empty. The inflow flows into the tank with 10 l of water per second. How high will the water be in the tank if it flows in for 3 minutes and 20 seconds?
Truck load capacity
The load capacity of the truck is 10t. Will it carry 200 oak planks measuring 30 cm, 4 m, and 30 mm at a time if the weight of 1 dm³ of oak wood is 0.7 kg?
Profitable company
Three businessmen decide to open up their own company. They agree to distribute the yearly profits made in the same ratio as their initial investments. They invest R 50 000, R 75 000, and R25 000, respectively. The profit made by the company in the first
Marlon
Marlon drew a scale drawing of a summer camp. In real life, the sand volleyball court is 8 meters wide. It is 4 centimeters wide in the picture. What is the drawing's scale factor? Simplify your answer and write it as a ratio, using a colon.
Pipe water flow
100 hl of water flows out of the tank through three pipes in 8 hours. How many hectoliters of water flow through four pipes in 10 hours?
The bakery
The bakery baked 325 cakes from 25 kg flour. How many kilograms of flour do they need to bake 195 pieces of such cakes?

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