Math practice for 13 year olds - page 331 of 434
Number of problems found: 8668
- 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? - Cacao
Cacao contains 34% filling. How many grams of fill are in 130 g cacao? - 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? - 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.
- Determine 3885
Determine the sum of the square roots of 81. - Determine 3880 Determine how much equals 16% of a) 32, b) 44, c) 34, d) 25
- Runner 2
Marian runs 12 meters in 8 seconds. How far would Marian run for 70 seconds if he still runs at the same pace? - 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.
- Percentage 3872
Milos had to do 20 clicks. However, he only made 16. What percentage did he miss in completing the task? - 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.
- Raspberries
Dano had 20 raspberries, and John had 90% more raspberries than Dano. Find the total number of raspberries Dano and Juraj have together. - 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?
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