Percentages + expression of a variable from the formula - practice problems - page 9 of 11
Number of problems found: 219
- VAT on books
The cost of a book in the store is 12.5 euros. How many euros is the VAT of this book? VAT is 10%. - Finding the base
Find the unknown base of percent: 12.5 percent of what = 16? - Isosceles triangle
The perimeter of an isosceles triangle is 112 cm. The length of the arm to the length of the base is at a ratio of 5:6. Find the triangle area. - Determine 5192
Determine the numbers x and y so that half of the number x is 30% of the number and 60% of y is 90.
- Plot
The length of the rectangle is 8, smaller than three times the width. If we increase the width by 5% of the length and the length is reduced by 14% of the width, the circumference of the rectangle will be increased by 30 m. What are the dimensions of the - Sugar cubes
The glass has 600 ml of tea, which represents 80% of the volume of the glass. If you put twenty regular sugar cubes of 2 cm in the tea, how many ml of tea are poured? - Isosceles right triangle
The area of an isosceles right triangle is 18 dm². Calculate the length of its base. - Influenza 4707
There were 36 new cases of influenza at the school during the study week, which was 40 percent less than in the previous week. How many new flu cases have been reported in the last week? - Ratio iso triangle
The ratio of the sides of an isosceles triangle is 7:6:7. Find the base angle to the nearest answer correct to 3 significant figures.
- Prescribed 4579
The racing ball for men has a prescribed weight of 7250g. It is made of iron. How does its diameter change if we make it from lead? The density of iron is 7.8 g / cm cubic, and the density of lead is 11.3 t / m cubic. - Obtained 4484
25% oil is obtained from one flaxseed. From how many kg of flax seeds is 1.5 kg of oil obtained? - Ordering 4452
Mr. Milan bought a new bicycle. The Milan he chose was out of stock, so he had to order it. When ordering, he paid a deposit of 110 euros, which is 40% of the total price. How many euros did Mr. Milan's bike cost? - Apples 2
Dried apples contain 15% water. Fresh apples contain 80% water. How many kilograms of apples do we need to buy to get 3 kg of dried apples? - Fuel economy
How many kilometers is sufficient petrol in the cylinder fuel tank with a diameter of 40 cm and the base of tank length of 1 m when it is filled to 60%, and if the car consumes 15 liters per 100 km?
- Unknown 4281
19% of the unknown number is 12, less than 23% of the same number. Specify an unknown number. - Cows
The agricultural cooperative has increased the number of housed cows by 14% to 285 units. How many cows increased the agricultural cooperative number of cows? - Percentage 3980
Calculate the percentage of waste when we cut out 4 of the largest possible circles from a square sheet with sides of 1 meter. - Cuboid enlargement
By how many percent increases the volume of the cuboid if every dimension increases by 30%? - Unknown number 7
16% of the unknown number is 21 less than the unknown number itself. Determine the unknown natural number.
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