Maths practice for 14 year olds - page 293 of 382

Number of problems found: 7626

Three friends
Three friends divided the profit by 104,650 CZK so that for every 4 CZK, which got the first friend, equals five crowns for the second, and for every 9 CZK, which got the second, equals 16 CZK for the third. Question: Who got the most and how much?
Unknown number 7
16% of the unknown number is 21 less than the unknown number itself. Determine the unknown natural number.
Three children
Three children eat 8 chocolates in 6 days. How many chocolates do 6 children eat in 18 days?
Coconut percentage
The bar contains 81g of coconut per 200g. What percentage of coconut does the bar have?
Shorts probability
Michal chose blue, white, red, orange, black, and brown shorts. What is the probability that he will select blue shorts?
Sum of members
What is the sum of the first two members of the arithmetic progression if d = -4.3 and a3 = 7.5?
Exponent value
Determine what z equals in the expression 169^z = 2 · 6.5
Cocoa percentage
Chocolate has 86% cocoa. Determine how many grams of cocoa are in 165-gram chocolate.
Exponent equation
What is the solution of the equation: 2^x = 2/64
Arithmetic progression
Determine the difference between members of AP and find the third term: 7; 3.6;...
Number ratio
The four numbers are in a ratio of 5:7:4:6. Their difference is equal to -84. Specify these numbers.
Work time
Josef would do the work himself in 5 hours. Josef and Michael would do the work together in 3.5 hours. Determine how long it would take Michael to do the job independently.
Root ratio
Determine the ratio of the square root of the number 27 and the square root of the number 16.
Number difference
The difference between the two numbers is 16. They are natural numbers. The first number is 17 times larger than the second number. Identify both of these numbers.
Exponential equation
Determine the value of having y in the expression (3^y): (4^-1)=36. Unknown y is a natural number greater than zero.
Rectangle
The perimeter of a rectangle is 48 cm. Calculate its dimensions if they are in the ratio 5:3 (width: height)
Money duo
Julius and Mark have 45 euros together. Mark has 50% more money than Julius. Determine the amount of money Mark and Julius have.
Cancer
Of the 80 people, 50 people were ill with cancer. What percentage of people isn't ill?
Exponent value
Determine the value of f: 0.49^f = 0.7
Exponential equation
Determine m (solve the exponential equation - unknown in the exponent): 0.25 μm = 0.5

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