Examples for 8th grade - page 5
Determine the radius of the circle, if its perimeter and area is the same number.
- 2nd class variations
From how many elements you can create 6480 variations of the second class?
Mr. Radoslav calculated that excavation for a water connection dig for 10 days. His friend would take 7 days. Radoslav worked 3 days alone. Then his friend came to help and started on the other end. On what day since the beginning of excavation they met?
Father dig up the garden in 13 hours. Son in 18 hours. How many hours take dig up the garden together?
What number is 24 % smaller than the number 51?
Is true for any number a,b,c,d equality:? ?
Gift box has rectangular shape with dimensions of 3×3×5 cm. Martin wants to cover with square paper with sides of 10 cm. How much paper left him?
Help little C.F. Gauss sum all the integers from 1 to 340.
- Katy MO
Kate draw triangle ABC. Middle of AB have mark as X and the center of the side AC as Y. On the side BC wants to find the point Z such that the content area of a 4gon AXZY was greatest. What part of the triangle ABC can maximally occupy 4-gon AXZY?
Calculate how many promiles river Hudson average falls, if on section long 921 km flowing water from 1224 m AMSL to 154 m AMSL.
- Two workers
Two workers together execute some work in 10 days. The first worker would have done himself in 20 days. How many days would have done himself a second worker?
The count of accidents in 1993 caused 8009 women which is 7.1%. How many men caused the accidents?
- Area of RT
Calculate the area of a right triangle which hypotenuse has length 20 and one hypotenuse segment has lenght 15.
From the cube of edge 52 cm was lathed maximum cylinder. What percentage of the cube is left as waste after lathed?
Circle arc corresponding to angle is 193° is 23 dm long. What is the length of the entire circle?
If the product twice price cut by 20%, what percentage was price cut in total?
The tale of the Seven Ravens were seven brothers, each of whom was born exactly 1.5 years after the previous one. When the eldest of the brothers was 4-times older than the youngest, mother all curse. How old was seven ravens brothers when their mother cur
Cube, which consists of 27 small cubes with edge 3 dm has volume:
Conduit has a cross section 222 mm. Maybe put it into 6 conductors with a cross section S2 $mm2?
What acreage has a rectangular plot whose diagonal is 34 meters long and one side has a length of 16 meters. ?