Functions - practice for 13 year olds - page 140 of 142
Number of problems found: 2826
- Rectangle - sides ratio
Calculate the area of a rectangle whose sides are in ratio 9:14 and perimeter is 388. - Barrel with liquid
Barrel with grain weight 297 kg. When it sheds 48% of grain, ha weight 174 kg, what is the weight of an empty barrel? - Triangle angles
The angles α, β, γ in triangle ABC are in the ratio 6:2:6. Calculate the size of angles. - Tractors
Fields go plow two tractors with various performances. The first tractor plows the whole field in 11 hours. The second tractor plows the whole field 19 hours longer. How long does it take to plow the whole field with two tractors?
- Tournament
Determine how many ways can be chosen two representatives from 34 students to school tournament. - Guests
How many ways can 8 guests sit down on 10 seats standing in a row? - Window
Peter demolish a box hole in the wall for the window frame 147×51 cm. When they come, they will find a master-fitted frame and window that glass is 13.3 cm from the hole in each direction. Calculate how much percent less light enters the window than - VAT
VAT is a tax on which the state artificially betrays goods and services for final consumption. VAT in Slovakia is 20%. Calculate how much percent pay fewer tax residents of Japonska, when VAT is only 5%. - Circumference - a simple
What is the ratio of the circumference of any circle and its diameter? Write the result as a real number rounded to 2 decimal places.
- Discounts on rail (ZSSK)
The railway company ZSSK offers a discount of 15% (REGIONAL) for 5 Eur/year. Calculate the real discount rate as a percentage, where passengers will travel 19 Eur per week. - Solidarity
Imagine a word solidarity means that salt donation to the needy, who have neither the salt. If we take the word solidarity has a word base on salt + gift (only in the Slovakian language). Calculate how many kilos of salt a sympathetic citizen "gives" gove - Sphere fall
How much percent fall volume of a sphere if diameter decreases 3×? - Density - simple example
Material of density of 1189 kg/m³ occupies a container volume of 64 cm³. What is its mass? - 3y inflation
The price of the roll rise in the first year by 9%, the second year fell by 5%, and in the third year increased by 3%. Calculate the average annual increase in the price of the roll.
- Inflation
Once upon a time, the tsar owned a money printer and printed and printed. Printing money prices went up in the first year 2.7 %, in the second 2.1%, in the third 3.6%, and in the fourth 5.4%. Then tsar failed in the election. Calculate the average annual - Circles
Three circles of radius 30 cm, 28 cm, and 37 cm are mutually tangent. What is the triangle perimeter whose vertices are the circles' centers? - Insurance
The house owner is insured against natural disasters and pays 0.04% annually of the value of the house 76 Eur. Calculate the value of the house. Calculate the probability of disaster if you know that 41% of the insurance is to pay damages. - Two doctors
Doctor A will determine the correct diagnosis with a probability of 89% and doctor B with a probability of 75%. Calculate the probability of proper diagnosis if both doctors diagnose the patient. - Slovak broad track
Once upon a time, we learned in school that the Russians have "wider" tracks than ours because they have less tolerable ground. In truth, decide only the area of sleepers, no track gauge. Calculate how many millimeters our track is 1435 mm, different from
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