All categories

3 years ago

25 decreased by 1/5 of a number is 18

Mathematics

2 answers:

astra-53 [7]3 years ago

5 0

25 - 1/5x = 18
1/5x = 25 - 18
1/5x = 7
x = 7 : 1/5
x = 7 * 5
x = 35
-----------

lorasvet [3.4K]3 years ago

5 0

The number is 35. 25-1/5*35(7)=18

You might be interested in

PLEASE SHOW FULL SOLUTIONS !!!!! WILL MARK BRAINLIEST FOR THE BEST ANSWER. THANK YOU AND GOD BLESS.

zhenek [66]

Answer:

a = 8

b ≠ 18

Step-by-step explanation:

y = 4x - 7

2y = ax + b

For there to be no solution, the lines (if graphed) should be parallel meaning that their slopes are equal but the y-intercepts are different

y = mx +b is the equation of a line where m is the slope and b is the y-intercept

Multiply the first equation by 2

2y = 8x - 14

2y = ax + b

So a has to equal 8

b can be anything except 14 (otherwise the lines would be the same)

4 0

2 years ago

Read 2 more answers

A street light is mounted at the top of a 15-ft-tall pole. A man 6 ft tall walks away from the pole with a speed of 4 ft/s along

mina [271]

Answer:

The tip of the man shadow moves at the rate of $\frac{20}{3} ft.sec$

Step-by-step explanation:

Let's draw a figure that describes the given situation.

Let "x" be the distance between the man and the pole and "y" be distance between the pole and man's shadows tip point.

Here it forms two similar triangles.

Let's find the distance "y" using proportion.

From the figure, we can form a proportion.

$\frac{y - x}{y} = \frac{6}{15}$

Cross multiplying, we get

15(y -x) = 6y

15y - 15x = 6y

15y - 6y = 15x

9y = 15x

y = $\frac{15x}{9\\} y = \frac{5x}{3}$

We need to find rate of change of the shadow. So we need to differentiate y with respect to the time (t).

$\frac{dy}{t} = \frac{5}{3} \frac{dx}{dt}$ ----(1)

We are given $\frac{dx}{dt} = 4 ft/sec$ . Plug in the equation (1), we get

$\frac{dy}{dt} = \frac{5}{3} *4 ft/sect\\= \frac{20}{3} ft/sec$

Here the distance between the man and the pole 45 ft does not need because we asked to find the how fast the shadow of the man moves.

7 0

3 years ago

Bestie Toys faces stiff competition from FunGadgets Inc., a rival firm with which Bestie Toys has achieved differentiation parit

stich3 [128]

Answer:

안녕하세요 나쁜 소식은 내가 너무 죄송합니다 것 질문 메신저 대답 할 수 없습니다

7 0

3 years ago

Find the next three terms in the geometric sequence: 400, 200, 100, 50

Elena-2011 [213]

It's dividing by 2.

Next 3 would be: 25, 25/2, 25/4 or converting those into decimals.

7 0

3 years ago

Read 2 more answers

A washer and a dryer cost $572 combined. The washer cost $78 less than the dryer. What is the cost of the dryer?

Anni [7]

Answer:

$325

Step-by-step explanation:

Let the dryer price be x, then the washer price would be x-78

x+x-78 = 572

2x = 650

x = 325

4 0

2 years ago