Examples for secondary school students
Number of problems found: 2068
- High wall
I have a wall 2m high. I need a 15 degree angle (upward) to second wall 4 meters away. How high must the second wall?
- School committee
7 students was elected to the school committee. In how many ways can the President, Vice-President, Secretary and Treasurer be selected?
- Research in school
For particular research in high school, four pupils are to be selected from a class with 30 pupils. Calculate the number of all possible results of the select and further calculate the number of all possible results, if it depends on the order in which th
On a staircase 3.6 meters high, the number of steps would increase by 3 if the height of one step decreased by 4 cm. How high are the stairs?
Determine how many ways can be chosen two representatives from 34 students to school tournament.
- Calculation of CN
- School parliament
There are 18 boys and 14 girls in the class. In how many ways can 3 representatives be elected to the school parliament, if these are to be: a) the boys themselves b) one boy and two girls
- Today in school
There are 9 girls and 11 boys in the class today. What is the probability that Suzan will go to the board today?
if ?, what is b?
Aviator sees part of the earth's surface with an area of 200,000 square kilometers. How high he flies?
How high is the building that throws horizontal shadow 95.4 m long at angle 50°?
On the pedestal high 4 m is statue 2.7 m high. At what distance from the statue must observer stand to see it in maximum viewing angle? Distance from the eye of the observer from the ground is 1.7 m.
- The tower
The observer sees the base of the tower 96 meters high at a depth of 30 degrees and 10 minutes and the top of the tower at a depth of 20 degrees and 50 minutes. How high is the observer above the horizontal plane on which the tower stands?
15 boys and 10 girls are in the class. On school competition of them is selected 6-member team composed of 4 boys and 2 girls. How many ways can we select students?
Is -10i a positive number?
How many different triads can be selected from group 38 students?
Find the value of the expression: 6!·10^-3
Is true equality? ?
- Big factorial
How many zeros end number 116! ?
- The mast
A 40 m high mast is secured in half by eight ropes of 25 m long. The ends of the ropes are equidistant from each other. Calculate this distance.