# Expression of a variable from the formula - 7th grade (12y) - math problems

#### Number of examples found: 209

- Simple equations

Solve system of equations: 5x+3y=5 5x+7y=25 - Unknown number 24

f we add 20, we get 50% of its triple. What is this unknown number? - Two thirds

Find two-thirds of the number equal to two-thirds of 99 - Simple equation 3

24 = n • 27, solve for n - Perimeter to area

Calculate the area of a circle with the perimeter 15 meters. - Given

Given 2x =0.125 find the value of x - Cargo

Car with cargo weight 7610 kg. Weight of car is 23% of the total weight of car and cargo. How heavy is cargo? - Cube

The sum of all cube edges is 30cm. Find the surface area of the cube. - Which

Which decimals when subtracted equal 3.89: a - b = 3.89 - Diagonal of square

Calculate the side of a square when its diagonal is 10 cm. - Area to volume

If the surface area of a cube is 486, find its volume. - Third dimension

Calculate the third dimension of the cuboid: a) V = 224 m^{3}, a = 7 m, b = 4 m b) V = 216 dm^{3}, a = 9 dm, c = 4 dm - Simplify 2

Simplify expression: 5ab-7+3ba-9 - Interior angles

Calculate the interior angles of a triangle that are in the ratio 2: 3: 4. - The perimeter 3

The perimeter of a rectangle is 35 cm. The ratio of the length to its width is 3:2. Calculate the dimensions of the rectangle - 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? - Hotel

The hotel has a p floors each floor has i rooms from which the third are single and the others are double. Represents the number of beds in hotel. - Rhombus A2p

Rhombus area is 13 cm^{2}and its height is 5cm long . Determine a perimeter of this rhombus. - Cube surface and volume

Find the surface of the cube with a volume of 27 dm^{3}. - Cube edges

The sum of the lengths of the cube edges is 42 cm. Calculate the surface of the cube.

Do you have an interesting mathematical word problem that you can't solve it? Submit math problem, and we can try to solve it.