Maths practice for 12-year-olds - page 280 of 362
Number of problems found: 7228
- Speed reader
Petr reads 12 pages of the book in 1 hour. Express a fraction of what part of the book it will read in 5 hours if it has 280 pages. - Efficiency
What is the power output of a kettle 2 kW with an efficiency of 90%? - Two-quarters 4068
The theatrical performance began at 7:30 PM and lasted two-quarters of an hour with one 20-minute break. What time did the show end? - Performance 4067
Twenty students will plant 1,200 trees in 4 hours. How many students do you need to plant 2100 trees in 3 hours at the same performance? - Plane II
A plane flew 50 km on a bearing of 63°20' and then flew in the direction of 153°20' for 140km. Find the distance between the starting point and the ending point. - Simple equation
Solve the following simple equation: 2. (4x + 3) = 2-5. (1-x) - Garden
A Garden with an area of 800 square meters rained 3 mm of water. How many 10-liter cans of water are needed for the same irrigation?
- Centimeters 4054
Find the surface of the cylinder if its diameter is 12 centimeters and its height is 9 centimeters. - Movement 4049
The crane in the assembly hall will move by 22.5 m in 1 1/4 minutes. What speed does it move if it is a steady movement? - Unknown number 11
That number increased by three equals three times itself. - Property 4047
Seven times the number minus 3 is as big as three times the same number minus 7. Which number has this property? - Through 4045
We should fill the water tank with a volume of 100 hl to 2/3 of the volume. How long does the filling take if 2.5 l of water per second flows through the hose? - Transferred 4040
The cowboy has 25 horses in two pens. He transferred 5 from the first to the second, then sold 7 horses from the second. How many horses were originally in the first pen? In the first enclosure, there were just 2 times more horses than in the second enclo - Trapezium bases
Find the trapezium's height if a = 8 cm and c = 4 cm, and its area is 21 square centimeters. - The water Can
A watering can full of water weighs 10 kg. Half-full can weigh 5.5 kg. How much weight is a can?
- Odd-numbered 4033
Mr. O. came up with two codes for the vault, which he alternates after a week. Both codes have the product of the digit 120. In an even week, it uses the smallest possible number as the code with this property. In the odd week, the largest. No number 1 in - Ornamental shrubs
Children committed to planting 240 ornamental shrubs. Their commitment, however, was exceeded by 48 shrubs. Write the ratio (r) of actually planted shrubs and commitment by the lowest possible integers a/b. - Solving the equation
x + 6/6 -x-3/3 = 3/4 - X-2 4025
x-2 / x-1 -2 = x + 1 / x-2 - Temporary sale off
With a temporary price reduction, the jacket's original fee of CZK 1,850 was reduced by 20%. Later, it was raised again by 20%. What was the jacket's final price?
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