Reason + fractions - practice problems
Number of problems found: 148
- There 25
There are four red marbles and six blue marbles in a bag. What is the probability of picking up one blue marble and then one red marble? (assume that you keep the blue marble out of the bag)
- Conditional 73664
I roll a 7-wall dice. What is the conditional probability that three fell if an odd number fell?
- Calculate 73024
Calculate the permille descent of the railway line in the section of 7.2 km by 21.6 m.
- Between 72924
How many ways do we know to select three cards from a deck of seven cards so that there are two red and one green between them?
- Probability 72324
We used the digits 2, 3, 4, 5, and 7 when entering the PIN code, and we only used each digit once. What is the probability that someone will guess our PIN code on the first try?
- Distinguish 71184
We randomly choose a family with three children. We distinguish between gender and age. Determine the probability that: a) the youngest girl will be among the children b) all children will be of the same sex
- Probability 71174
Find the probability that one will fall at least once in three rolls.
- Combinations 70714
If we increase the number of elements by 1, the number of combinations of the third class without repetitions increases by 10. How many elements do we have?
- Three-digit 69114
How many three-digit numbers have a digit sum of 6? Write the ratio of the number of created even and odd numbers and adjust it to the basic form.
- Probability 68564
What is the probability that the number a) greater than 4, b) the number greater than four will fall on the dice roll?
- Workshops 67984
In eight workshops, 40 employees process 32 tons of oranges. How many workers will process 9 tons of oranges in 9 workshops?
- Transported 67924
On Thursday, 240 skiers had to be transported, with two buses taking 30 minutes. How long did the transport take on Saturday if there were 660 skiers on the piste and three buses were used?
- Average 66794
Look for three numbers with an average of 2000. The middle number is 2000
- Expression 66754
Find the largest natural number n for which the value of the expression (37-2n) / 3 equals the natural number.
- Percentage 65844
Mr. Josef sold home-grown potatoes at 79 cents per kilogram. When he had the last 5 kg, he told the customer: collect them all for 3 euros! By what percentage did Mr. Josef reduce the potatoes?
- Numbers 65734
There are 100 tickets in a pocket with the numbers 1 to 100. What is the probability that we will randomly draw a ticket with a number starting with the number 5?
- Triangle from sticks
Bob the boulder has many sticks of lengths 3.5 and 7. He wants to form triangles, each of whose edges consists of exactly one stick. How many non-congruent triangles can be formed with the sticks?
Jan has 3/8 kilogram of pechay. If he shares 1/8 kilogram with each of his friends, how many of his friends can receive the pechay?
The ratio of dry matter and water is 1:9 for most mushrooms. Dry matter consists of carbohydrates, proteins, minerals, fat, and water in a ratio of 50:30:8:3:9. How many kilograms of fresh mushrooms need to be processed into a 10 kg package of dried mushr
- Children 58031
The children talked about how they spent the holidays at school. 2/3 of them were on holiday with their parents. There were ten children by the sea, which is 5/8 of those who were on vacation. How many children are in the class of children?
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