Math practice for 13 year olds - page 86 of 419

Number of problems found: 8372

Average 80442
The daily need for fat for a person is 80g on average. Almonds contain 45% fat. How many grams of almonds would a person have to eat if he wanted to cover his daily need for fats by eating only almonds?
Decrease 80441
By what percent does a cube's volume decrease if its edge length is reduced by a quarter?
Contains 80440
Cow's milk contains an average of 3.6% fat. How many liters of milk are needed to make 250g of butter? Butter contains 82% fat.
One-fifth 80438
By what percent does the area of a square increase if its perimeter increases by one-fifth?
Fertilized 80437
Nitric lime contains an average of 19% nitrogen and 55% calcium oxide. How many grams of nitrogen per 1 m² if we bought a 25 kg package and thereby evenly fertilized a garden of 12 a?
Rectangular 80436
The longer dimension of the rectangular plot was reduced by one-fifth, and the shorter dimension by 8%. By what percentage did the amount of land decrease? What is the perimeter of the fence now if the original dimensions of the fence were 60m and 25m?
Carbohydrates 80435
Bread contains an average of 52% carbohydrates, and apples have 12% carbohydrates. How many apples weighing 220g would you have to eat to get as much carbohydrate as 150g of bread?
Germination 80433
The germination rate of Hokkaido pumpkin seeds is 92%. The weight of 10 seeds is 1.6 g. How many plants will sprout if we sow 20 g of seeds?
Joe spends
Joe spends 3 3/4 hours each day of the week doing his homework, but Mirabel spends only 2 hours each day of the week on hers. How long in a week does Joe spend on his homework more than Mirabel?
The mass
The mass of a table is 6.4 kg, and the mass of a chair is 800 g. How many times is the table heavier than the chair?
Elisa
Elisa got the following grades in five subjects: 87, 88, 89, 88, and 90. What is her average in the five subjects?
Carates
A 5/8 karat diamond was purchased for $1200. What would a similar diamond weigh 1 karat cost?
Proportional relationship 2
If y is proportional to x, and y=150 when x=2.4, what is the value of y when x=3.5
The cost 8
The cost of 7/2 meters of cloth is $231/4. What is the cost of one meter of cloth?
Cutting in the ratio
Suppose a 75 m rope is cut in the ratio of 2/3. What is the measure of the longest cut?
Solve 17
Solve a reciprocal equation: 18 36/64=9:n
Consecutive integers
The sum of three consecutive integers is 228. Find the three consecutive integers.
Water meter
The readings on a water meter in April and May were 417.8 m³ and 430.4 m³. If there is a basic charge of P23 and the cost per cubic meter is P20, how much is the billing for water consumption? * a. P252 b. P254 c. P272 d. P275
A pentagon
Find the perimeter of a pentagon whose sides measure 11/2 cm, 7/4 cm, 3 1/3 cm, 2 1/3 cm and 2 1/12 cm.
The sum 26
The sum of Anna and Ina's ages is 19. In 4 years, Anna will be twice as old as Ina. What are their ages now?

Do you have unsolved math question and you need help? Ask a question, and we will try to solve it. We solve math question.