Maths practice for 14 year olds - page 288 of 370

Number of problems found: 7388

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 eight chocolates in 6 days. How many chocolates do six children eat in 18 days?
Percentage 3892
The bar contains 81g of coconut per 200g. What percentage of coconut does the bar have?
Probability 3891
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?
Expression 3887
Determine what z equals in the expression 169^z = 2 · 6.5
Chocolate 3886
Chocolate has 86% cocoa. Determine how many grams of cocoa are in 165-gram chocolate.
Equation: 3881
What is the solution of the equation: 2^x = 2/64
Difference 3878
Determine the difference between members of AP and find the third term: 7; 3.6;...
Difference 3875
The four numbers are in a ratio of 5:7:4:6. Their difference is equal to -84. Specify these numbers.
Independently 3874
Josef would do the work himself in 5 hours. Josef and Michal would do the work together in 3.5 hours. Determine how long it would take Michal to do the job independently.
Determine 3873
Determine the ratio of the square root of the number 27 and the square root of the number 16.
Difference 3870
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?
Determine 3861
Determine the value of f: 0.49^f = 0.7
Exponential 3858
Determine m (solve the exponential equation - unknown in the exponent): 0.25 μm = 0.5
Price saleoff
Shoes cost y euros. They were first discounted by 12% and then 50% of the new amount. After this double discount, the cost was exactly 22 euros. Determine the original price of the shoes.

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