Math practice for 13 year olds - page 333 of 428

Number of problems found: 8549

Geometric progression
Determine the sum of the first three members of GP if q = 2 and a4 = 2.4.
Equation
Solve the equation: 1/2-2/8 = 1/10; Write the result as a decimal number.
Percentage calculation
Determine 120% of numbers 16, 32, 48, and 52.
Bottle rows
There are 48 bottles in the third row, seven fewer in each row than in the previous row. Find the number of bottles in the first row.
Two numbers
The sum of the two numbers is 48. 12.5% of the first number equals exactly 4. Find both of these numbers.
Exponent value
Determine y: 32^y = 2
Number puzzle
Darius said to Miloš: I think a number. If I square it to one-fourth and then multiply it by 3, I get its square root. Find the unknown number that is greater than zero and belongs to the set of positive integers.
Diagonals
The diagonal of a rhombus is 20 cm long. If its side is 26 cm, find the length of the other diagonal.
Brief probability
Natalia went to the closet to pick out Daniel's briefs. Daniel has one piece of white briefs and one piece of black briefs in the closet. What is the probability that Natalie will take off his white briefs?
Exponent value
Determine what y equals in the expression 5^y = 1/25
Mean
The mean of 50 items for a student's food is 38.6. When checking the work, he found that he had taken one item as 50 to read as 40 correctly in these circumstances. What should the correct arithmetic mean?
Expression value
Specify the value of the expression: (1024^0.1): 9
Exponent value
Calculate the value of y: 3^y = 0.333
Money distribution
Dano and Juraj have a total of 120 euros. Juraj has 40% less money than Daniel. Determine how much money Daniel and Juraj have.
Cargo
The car with cargo weighs 7610 kg, which is 23% of its total weight and cargo. How heavy is the cargo?
Exponent equation
Which number is hidden behind x: 2 · x = 16^0.5
Poster rental
The poster area consists of a mantle with a diameter of 80 cm and a 1 m. The tenant pays CZK 20 per day for 1 square meter of space. How much does it cost to rent the whole area for July?
Cube surfaces ratio
The volumes of the two cubes are in the ratio of 27:8. What is the ratio of the surfaces of these cubes?
Stolen amounts
X + Y = 31835 X is the amount stolen by 1,2 and 3 Y is the amount stolen by 4 and 5 1. stole half of X, 2. half the rest and 3 more on top of that 3. stole 6801.5 4. He stole 1/9 of Y, which is 513 5. He stole the rest
Money
Peter has 2x more money than Michael. However, if Peter gave Michael € 16, Michael would have 3.5 times more money than Peter. Find how much money was initially sent from Peter and how much Michael.

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