# 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, _, _ - Radius

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/m^{3} - 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

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? - Diameter

What is the inside diameter of the cylinder container and if half a liter of water reaches a height 15 cm? - Raspberries

Dano had 20 raspberries. John had 90% more raspberries than Dano. Determine how many raspberries have Dano and Juraj together.

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