Sets - practice for 13 year olds - last page
Number of problems found: 77
- Socks
One pair of socks worth CZK 27. A set of 3 pairs of these socks are sold with a 10% discount. How much will we pay CZK for two offered sets of socks? - Rings groups
Twenty-seven pupils attend some groups. Fourteen pupils attend the Dance group, 21 sports group, and 16 in the dramatic group. Dance and sporting attend nine pupils, dance and drama six pupils, sporty and dramatic 11 pupils. How many pupils attend all thr - Different 4117
The florist has 18 tulips and 15 freesias. How many different bouquets can she make if she uses all the flowers? How many freesias will there be in one bouquet? - Infinitely 3489
The solution to the equation 3x = 8x is a / no real number b / x = 8/3 c / x = 3/8 d / x = 0 e / infinitely many solutions
- Two-digit 3456
Write all the two-digit numbers that can be composed of the digit 7,8,9 without repeating the digits. Which ones are divisible b) two, c) three d) six? - Summer camp
Out of the 180 students at a summer camp, 72 signed up for canoeing. Twenty-three students signed up for trekking, and 13 also signed up for canoeing. Use a two-way table to organize the information and answer the following question: Approximately what pe - Solve
Solve this direct relation by the triplet: 0.25h. .. . . .. .. . . .. .. .. 3 pcs 6.5h. .. . . .. .. . . .. .. . . .. .. x pcs - 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 - 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? - Segments
Line segments 69 cm and 3.7 dm long we divide into equal parts which lengths in centimeters is expressed integer. How many ways can we divide? - 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? - Ace
We pulled out one card from complete sets of playing cards (32 cards). What is the probability of pulling the ace? - Count of roots
How many solutions have equation x. y = 7757 with two unknowns on the set of natural numbers?
- Scrap
From 19 products are 4 scraps. What is the probability that the random pick of 2 products has no defective product? - 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 - Two doctors
Doctor A will determine the correct diagnosis with a probability of 89% and doctor B with a probability of 75%. Calculate the probability of proper diagnosis if both doctors diagnose the patient.
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