# Examples for 7th grade (seventh)

1. Steel tube
The steel tube has an inner diameter of 4 cm and an outer diameter of 4.8 cm. The density of the steel is 7800 kg/m3. Calculate its length if it weighs 15 kg.
2. Sales off
After discounting 40% the goods cost 15 €. How much did the cost of the goods before the discount?
3. Three-quarters of its volume
The pool has a block shape with a length of 8m, a width of 5.3m and a depth of 1.5m. How many hl of water is in it if it is filled to three-quarters of its volume?
4. Proportion 3
For every 8 mango trees in the orchard, there are 4 star apple trees. If there are 1320 trees, how many trees of each kind are there?
5. Eq-frac
Solve the following equation with fractions: h + 1/3 =5/3
6. Diameter of a cylinder
I need to calculate the cylinder volume with a height of 50 cm and a diameter of 30 cm.
7. The temperature 3
The temperature is -12 degrees Fahrenheit. During the following 5 hours the temperature decrease 23 degrees Fahrenheit what is the temperature at 11 pm?
8. Fruits 2
An apple costs 7p and a melon costs seven times more. How much will 6 apples and 2 melons cost
9. Find the 11
Find the quotient of 229.12 and 12.32
10. One third
If 3/5 is 360, how much is 1/3?
11. Spending
Peter spends 1/5 of his earnings on his rent and he saves 2/7. What fraction of his earnings is left?
12. Stock market 2
For the week of July 22, the following day to day changes in the stock market was recorded a certain stock: -2 on Monday; +4 Tuesday; -8 Wednesday; + 2 1/2 Thursday; - 3 1/4 Friday. The stock began the week at 78 points. How many points did it finish with
13. Missing number
Blank +1/6 =3/2 find the missing number
14. Bag of peanuts
Joe eat 1/3 of a bag of peanuts, mark eat 1/4 of the remaining in the bag of peanuts, Alvin eat 1/2 of the remaining bag of peanuts, peter eat 10 peanuts, there are 71 peanuts left. Hon many peanuts were in the bags?
15. Aquarium
I have an aquarium that is 100 cm long and 40 cm wide and 40 cm in height. We fill it with water. How much will it weigh?
16. Examination 2
In an examination, a teacher awards 2 marks for every correct answer and subtract a mark for every wrong answer. If there are 20 questions and a child scored 25 marks how many correct answer did the child get?
17. 80 students
80 students were asked what type of test they preferred. 50 students said they liked multiple choice and 42 liked true or false. If 36 liked both multiple choice and true or false types, how many students preferred multiple choice only?
18. Chester
Chester has a piece of wood measuring 1 2/3 cm he needs to cut it to pieces measuring 3/4 cm long. How many pieces of wood did Chester cut?
19. The perimeter 3
The perimeter of a rectangle is 35 cm. The ratio of the length to its width is 3:2. Calculate the dimensions of the rectangle
20. A jewelry
A jewelry store has 20 grams of gold. If a pair of earrings need 1/4 gram of gold, how many grams are not used?

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