Ratio - practice for 13 year olds - page 18 of 41
Number of problems found: 802
- Transformer
Transformer - U1 = 230 V, N1 = 300, N2 = 1,200, I1 = 4 A. Calculate the transformation ratio, voltage and current in the secondary coil. - Twice of radius
How many times does the surface of a sphere decrease if we reduce its radius twice? - Divide in ratio
Line segment AB is 12 cm long divided in a ratio of 5:3. How long are the individual parts? - Save trees
Twenty-five tons of old paper will save 1,600 trees. How many tons of paper are needed to save the 32 trees in the park?
- Similarity 26441
How long a shadow casts a building 15 m high if the shadow of a meter rod is 90 cm? Sketch - similarity. - Advertising 26331
The can of juice is 15 cm high. For advertising purposes, they made a model that can enlarge in a ratio of 5:3. How tall is the advertising? - Cuboid edges
Calculate the volume and surface of a cuboid whose edge lengths are in the ratio 2:3:4 and the longest edge measures 10cm. - Ratio
Alena collected 7.8 kg of blueberries, 2.6 kg of blackberries, and 3.9 kg of cranberries. Express the ratio in the smallest natural numbers in this order. - Six workers
Six workers earned a total of CZK 12,600 per week on the construction site (5 working days). How much do seven workers earn in 10 days with the same daily average salary?
- Cutting cone
A cone with a base radius of 10 cm and a height of 12 cm is given. At what height above the base should we divide it by a section parallel to the base so that the volumes of the two resulting bodies are the same? Express the result in cm. - Two resistors
Two resistors, 20 Ω, and 60 Ω, are connected in series, and an external voltage of 400 V is connected to them. What are the electrical voltages on the respective resistors? Please comment! - Divided 25071
Divided to a ratio of 5:3 100 people. - Divide 25001
Divide 25 pairs of socks in a ratio of 2:3:5 - Double ratio
The mobile phone was twice gradually discounted in the ratio of 3:2 and one half: 5 quarters. How much did it initially cost if the price was CZK 4,200 after a double discount?
- Five combers
Five combers harvest 12 rows of strawberries in 4 hours. How many rows of strawberries will two combers harvest in 10 hours? - Athletics 24911
The sports class is attended by athletes, cyclists, and football players. The number of athletes to cyclists is in the ratio 3:5, football players to cyclists 1:3. How many athletes attend the class if 9 children are involved in athletics? - The circumference
The circumference and width of the rectangle are in a ratio of 5:1. Its area is 216cm². What is its length? - The piglet
The weight of the piglet regularly grew by five kilograms for four months. Determine the proportion by weight of the piglet each month if the first weighed 35 kg. - Age of family
The age of father and son is in a ratio of 10:3. The age of the father and daughter is in a ratio of 5:2. How old are a father and a son if the daughter is 20?
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