Maths practice for 14 year olds - page 144 of 362
Number of problems found: 7228
- Truncated cone
Find the volume and surface area of the truncated cone if r1 = 12 cm, r2 = 5 cm, and side s = 10 cm. - Cone surface volume Calculate the surface and volume of the cut rotating cone with base radii of 14 cm and 8 cm height of 11 cm.
- Class group distribution
In one HA class, there were 8 more pupils in the first group than in the second group. After the admission of two new pupils to each of the groups, there were twice as many pupils in the 1st group as in the 2nd group. How many pupils were there in each gr - Right isosceles triangle
What can be the area of a right isosceles triangle with a side length of 8 cm? - Two grandmothers
Two grandmothers went to the market to sell eggs, and they had 100. When they sold all the eggs, they made the same money. The first grandmother said to the second, "If I sold my eggs for your price, I would earn 15 crowns. " The other grandmother replied - Earning 2
Rahul earns 5000 Rs, and he saves 500 Rs. What percentage of his earnings does he save? - Machine production
Six equally powerful machines produce 870 parts in 14 hours. Calculate in how many hours 870 parts will have four such machines. - How many 9
How much percent volume remains of a sphere if the diameter decrease 3×? - Flower petal
We have 30 flowers, and each one has three or four petals. They have a total of 102 chips. How many flowers have four petals? Z represents the number of flowers with 4 petals. Choose the expression that determines the number of flowers with 3 petals. - Ratio in trapezium
The ratio of the height v and the base a, c in the trapezoid ABCD is 1:6:3. Its area is 324 square cm, and the peak angle B is 35 degrees. Determine the perimeter of the trapezoid. - Four sides of trapezoid Calculate the area of the ABCD trapezoid with sides a = 65 cm, b = 29 cm, c = 40 cm, d = 36 cm
- Free fall
How long and at what speed does the body fall to the ground during a free fall from a height of 35 m? - The average height
The average height of six friends is 181 cm. Peter came among them, which reduced the average height by 2 cm. Calculate Peter's height. - Salt solution preparation
Prepare 2 liters (kg) of a 3% salt solution in water. - Participants
Of the 48 participants, six were women, fewer than men, and 24 were children, less than all adults. Calculate the percentage of all participants on the tour who are children. - Hydrogen peroxide solution
Prepare 250 g of a 30% solution of hydrogen peroxide in water. - Salicylic acid solution
Prepare 600 g of an 8% solution of salicylic acid. - Blue rock solution Prepare 100 g of a 15% blue rock solution.
- Odd number creation
How many odd three-digit numbers can you make of the five cards with the numbers 1, 2, 3, 5, and 6? - Plane distance
Two planes took off from Prague at one point. The first is flying north at a speed of 420 km/h, and the second is flying east at a speed of 560 km/h. How far apart will they be as the crow flies in 25 minutes of flight?
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