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Ilya [14]
2 years ago
7

15 masons can renovate a hall in 20 days. How many masons will renovate the hall in 12 days?.

Mathematics
1 answer:
Nastasia [14]2 years ago
5 0

Answer:

9

Step-by-step explanation:

Use rule of three

15 => 20

x => 12

x=\frac{12*15}{20}

x = 9

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Phyllis invested 51000 dollars, a portion earning a simple interest rate of 4 percent per year and the rest earning a rate of 7
Liono4ka [1.6K]

Answer:

Phyllis invested $11,000 at a simple interest rate of 7 percent per year and $40,000 at a simple interest rate of 4 percent per year.

Step-by-step explanation:

From the information provided, you can write the following equations:

x+y=51000 (1)

0.04x+0.07y=2370 (2), where

x is the portion earning a simple interest rate of 4 percent per year

y is the portion earning a simple interest rate of 7 percent per year

First, you can isolate x in (1):

x=51000-y (3)

Now, you can replace (3) in (2) and solve for y:

0.04(51000-y)+0.07y=2370

2040-0.04y+0.07y=2370

0.03y=330

y=330/0.03

y=11000

Then, you can replace the value of y in (3) to find the value of x:

x=51000-11000

x=40000

According to this, the answer is that Phyllis invested $11,000 at a simple interest rate of 7 percent per year and $40,000 at a simple interest rate of 4 percent per year.

3 0
2 years ago
Write the quadratic equation whose roots are
maks197457 [2]
The quadratic equation y = ax^2 +bx+c can be written in the form:
y = a(x-p)(x-q)
Where p and q are the roots of the equation.
Given p = 4, q = -2, a = 3, the quadratic will look like this:
y = 3(x-4)(x+2)
Finally, distribute and combine like terms to put it in standard form.
y = 3(x^2 - 4x+2x -8) \\  \\ y = 3(x^2 -2x-8) \\  \\ y = 3x^2 -6x -24
5 0
3 years ago
Y over 4 -3=4 what is y?
quester [9]

Answer:

y = 28

Step-by-step explanation:

As I interpret your post, you want to solve

y

---- - 3 = 4 for y.  

 4

First, add 3 to both sides:  y/4 = 7.

Next, mult. both sides by 4 to eliminate the fraction:  y = 28.

6 0
3 years ago
Read 2 more answers
A person earns $187.42 before deductions for 3 days work . What is the rate of per hour assuming 8 hours of work per day ?
Bingel [31]
7.809125 dollars per hour

6 0
3 years ago
* PLEASE HELP *
LiRa [457]
The first one is 135 per hour if you barely went 90 miles in a hour in a half, and the second one it is 1/3+1/3+1/3 you add 2 more thirds so it means you add 2 forths 1/4/+1/4+1/4=3/4 so you paint 3/4's of the wall
5 0
3 years ago
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