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Number of problems found: 94
- Czech crowns
Small Petra saves money. Grandfather gives her ten crowns. Petra asked his older sister to let her calculate how much he had saved. Sister told her that he had less than 30 crowns. If the sum is divided by three, leave one crown. Suppose the sum is divide - Pytagoriade
Two fifth-graders teams compete in math competitions - Mathematical Olympiad and Pytagoriade. Of the 33 students who competed in at least one of the contests, 22 students. Students who competed only in Pytagoriade were twice as many who just competed in t - Trousers
In the class were 12 students. Nine students were wearing trousers and turtlenecks eight. How many students wore trousers with a turtleneck? - Classroom 3
How many children are in the classroom, where 13 children are higher than Lenka and nine children lower than Lenka?
- Families
In the class, we investigated how many children have families in which they live. How many % of pupils live in families with more than two children? If five families have one child, nine families have two children, five families have three children, two f - Holidays
Of the 35 students in the class, were seven on holiday in Germany and just as many in Italy. Five students visited Austria. In none of these countries were 21 students. One student visited all three. In Italy and Austria were two students and in Austria a - Pizza master
Master says that he can split pizza into 16 parts by five equals straight cuts. Is it possible? - Cookies
In the box were a total of 200 cookies. These products have sugar and chocolate toppings. The chocolate topping is used on 157 cookies. Sugar topping is used on 100 cakes. How many of these cookies have two frostings? - Lentilka
Lentilka made 31 pancakes. Eight don't fill with anything, 14 pancakes filled with strawberry jam, and 16 filled with cream cheese. a) How many Lentilka did strawberry-cream cheese pancakes? Max ate four strawberry-cream cheese and all pure strawberry pan
- Buffet
At the school, buffet were 30 children. Twenty-one children bought sandwiches, and 15 children bought lemonade. Four children did not buy anything. How many children bought lemonade and sandwiches? - Pairs
Teachers must choose one pair of boys and girls from the five girls and four boys. A) How many such pairs of (M + F)? B) How many pairs were only boys (M + M)? C) How many are all possible pairs? - Camp
In a class are 36 children. During the holidays, 20 children were in the camps and 18 children on holiday with their parents. Find the minimum and the maximum number of children that may have been in the camp and on holiday with their parents at the same - Energy saving
They released three different independent inventions saving 15%, 17%, and 16% energy. Some considered that while the use of these inventions, the total savings will be 15% + 17% + 16% = 48%. Is this true? How much will the percent of energy save all three - Family
A man and a woman have 7 daughters together (or - "with each other" so that step-children are excluded). Each daughter has one brother. How many members are in the immediate family?
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