# Expression of a variable from the formula + multiplication - math problems

#### Number of problems found: 24

• The product 3
The product of the two numbers is 15 ⁵/₆. If one of the numbers is 5 ²/₃, find the other.
• The ratio 4
The ratio of two number is 5:4 if 40% of the first number is 12, what will be 50% of the second number?
• A number 5
A number is divisible by 24, 25, and 120 if it is increased by 20. Find the number.
• Boys and girls 8
In a class of 35 boys and girls that has a ratio of 2:5, 5 boys are absent and 5 boys are present. How many students are present?
• Two numbers and its product
The product of two numbers are 2/3. If on of them is 1/10, what is the other?
• Consider 2
Consider the following formula: y = 3 ( x + 5 ) ( x - 2 ) Which of the following formulas is equivalent to this one? A. Y=3x2+9x-30 B. Y=x2+3x-10 C. Y=3x2+3x-10 D. Y=3x2+3x-30
• A cook
A cook wants to make enough cookies for 159 students. The cookie recipe makes 1 1/4 dozen cookies. A dozen equals 12. How many batches does the cook need to make if each student gets one cookie?
• Cheese consumption
I have some cheese. I used 2/5 of the total amount of cheese yesterday. Today, I used 2/5 of the remaining cheese from yesterday. If 900 g of cheese remain at the end of today, how many grams of cheese did I have originally?
• The solar
The solar heating tank has the shape of a rotating cylinder. When the tank is in a horizontal position, the water in the tank wets 4/5 each tank bases. If we place the tank in a vertical position, the water in the tank will reach up to 1.2 m. Calculate th
• The length 2
The length of a rectangle is 12y2 – 15y + 8 and the width is 7y – 11. Find the area of the rectangle
• Linear combination of complex
If z1=5+3i and z2=4-2i, write the following in the form a+bi a) 4z1+6z2 b) z1*z2
• Squares above sides
In a right triangle, the areas of the squares above its sides are 169; 25 and 144. The length of its longer leg is:
• Uboid volume
Calculate the cuboid volume if the walls are 30cm², 35cm², 42cm²
• Simplify
Simplify expression - which expression is equivalent to: 3(m + 2) − 4(2m − 9)
• Eggs
3400 eggs sliced hens for February and March. We have to calculate how many hens can make 3400 eggs when one hen give 2 eggs a day for 59 days.
• Two thirds
Find two-thirds of the number equal to two-thirds of 99
• Elements
If the number of elements is decreased by two the number of permutations is decreased 30 times. How many elements are?
• Four swords
Obelix has three helmets, four swords, and five shields. How many words must make at the blacksmith forge Metallurgix to be able to walk another 90 days in unique armor?
• Bookshelve
Bookshelve with an original price of € 200 twice become cheaper. After the second discounted by 15% the price was € 149.60. Determine how much % become cheaper for the first time.
• Cylinder twice
If the radius of the cylinder increases twice, and the height is reduced twice, then the volume of the cylinder increases (how many times?):

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Expression of a variable from the formula - math problems. Multiplication Problems.