Expression of a variable from the formula - 7th grade (12y) - math problems
Number of problems found: 238
- Two thirds
Find two-thirds of the number equal to two-thirds of 99
- Simple sequence
Continue with this series of numbers: 1792,448, 112, _, _
Determine the radius of the circle, if its perimeter and area is the same number.
- Sum of four numbers
The sum of four consecutive natural numbers is 114. Find them.
- Cross five
The figure on the picture is composed of the same squares and has a content of 45cm². What's its perimeter?
- Greg and Bill
Greg is 18 years old. He is 6 less than 4 times Bill's age. How old is Bill?
- Car and cyclist
Cyclist started from town at speed 18 km/h. After 1 hour 30 min started the car from town and caught up with the cyclist in 50 minutes. How fast was a car?
- Interior angles
Calculate the interior angles of a triangle that are in the ratio 2: 3: 4.
- One and a half chicken
One and a half chicken bears one and a half egg in one and a half day. How many eggs can withstand from 6 chicken in 6 days?
- Circle chord
Calculate the length of the chord of the circle with radius r = 10 cm, length of which is equal to the distance from the center of the circle.
- Volume of sphere
How many times does the volume of a sphere increase if its radius increases 2 ×?
- Find the
Find the radius of the circular base of the vessel, whose perimeter is 2.51 m. Write the result to one decimal place in meters. Via the π sign - Ludolph's number
- Cube edge
Determine the edges of the cube when the surface is equal to 37.5 cm square.
- Cone from cube
The largest possible cone was turned from a 20 cm high wooden cube. Calculate its weight if you know that the density of wood was 850 kg/m3
- Cube edges
The sum of the lengths of the cube edges is 42 cm. Calculate the surface of the cube.
- Twice of radius
How many times does the surface of a sphere decrease if we reduce its radius twice?
- Unknown number 24
f we add 20, we get 50% of its triple. What is this unknown number?
Alley measured a meters. At the beginning and end are planted poplar. How many we must plant poplars to get the distance between the poplars 15 meters?
What is the inside diameter of the cylinder container and if half a liter of water reaches a height 15 cm?
Dano had 20 raspberries. John had 90% more raspberries than Dano. Determine how many raspberries have Dano and Juraj together.