1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
gayaneshka [121]
3 years ago
7

I bought 10 presents for Christmas. Some were £20 and some were £22.50. If the total cost was £217.50 how many of the £22.50 pre

sents did I buy​
Mathematics
1 answer:
Burka [1]3 years ago
8 0

Answer:

Let's denote:

Number or gifts cost 20 = x

Number or gifts cost 22.5 = y

Then, we have:

x + y = 10

20x + 22.5y = 217.5

=> 20(10 - y) + 22.5y = 217.5

=> 2.5y = 17.5

=> y = 7 (Number or gifts cost 22.5)

=> x = 10 - 7 = 3 (Number or gifts cost 20)

Hope this helps!

:)

You might be interested in
A painter can paint 350 square feet in 1.25 hours what is the painting rate per square feet per hour
pashok25 [27]

Answer:280 square feet per hour.

Step-by-step explanation:

7 0
3 years ago
Can someone do this for me please???? i need it done fast!!
KIM [24]

Depends on what it is

6 0
3 years ago
A car is traveling at 20.0 m/s, and the driver sees a traffic light. turn red. After 0.530 s (the reaction time), the driver app
slava [35]
Before the driver applies the brakes ( with the reaction time ):
d 1 = v0 · t = 20 m/s · 0.53 s = 10.6 m
After that: 
v = v0 - a · t1  
0 = 20 m/s - 7 · t1
7 · t1 = 20
t1 = 2.86 s
d 2 = v 0 · t1 - a · t1² / 2
d 2 = 20 m/s · 2.86 s - 7 m/s² · (2.86 s)²/2 = 57.2 m - 28.6 m = 28.6 m
d = d 1 + d 2 = 10.6 m + 28.6 m = 39.2 m
Answer: the stopping distance of a car is 39.2 m.
5 0
3 years ago
PLS HELP ASAP PLZ PLZ PLZ
KIM [24]
I am unsure about the very last problem but I can help with the first two

1) (y+1)+4

If we combine the numbers 1 and 4, we get +5 and can isolate the numbers from the variable.

This would give us

y + 5 =

2) (6*r)*7

remember that we do not have to explicitly state 6*r

Instead, we can write it as 6r

this helps us get rid of the parentheses

now we can write it as 6r * 7=

I hope this helps!:)

6 0
3 years ago
Tara wants to weigh her three stuffed animals. They will only fit on the scale two at a time. Together Addie and Missy weight 18
Pepsi [2]

Answer: Addie weighs 4 ounces

Missy weighs 14 ounces

Corky weighs 8 ounces

Step-by-step explanation:

Let a represent the weight of Addie.

Let m represent the weight of Missy.

Let c represent the weight of Corky.

Together Addie and Missy weigh 18 ounces. This means that

a + m = 18 - - - - - - - - - 1

Missy and Corky weigh 22 ounces. This means that

m + c = 22

m = 22 - c - - - - - - - - - - 2

Addie and Corky weigh 12 ounces. This means that

a + c = 12

a = 12 - c - - - - - - - - - - - 3

Substituting equation 2 and equation 3 into equation 1, it becomes

22 - c + 12 - c = 18

34 - 2c = 18

- 2c = 18 - 34 = - 16

c = - 16/ - 2 = 8

Substituting c = 8 into equation 2, it becomes

m = 22 - 8

m = 14

Substituting c = 8 into equation 3, it becomes

a = 12 - 8

a = 4

3 0
3 years ago
Other questions:
  • 11. Write the equation of the line.
    12·1 answer
  • Compare 3.21 and 0.2
    11·2 answers
  • -2w-(+9w-7)-2w+9-5w=<br>​
    5·1 answer
  • The square root of a number is between 5 and 6. Which of the following could be the
    10·1 answer
  • Madison wants to order T-shirts for the University which consist of 12,000 students she takes a random sample to figure out how
    8·1 answer
  • Jadon is making a trail mix of chocolate pecans and peanuts to sustain him and his teammates
    9·1 answer
  • To eliminate the x terms and solve for y in the fewest steps, by which constants should the equations be multiplied by before ad
    5·2 answers
  • Louis is filling two tanks of water in his home. Tank A currently contains 27 gallons and has a hose filling it at
    12·1 answer
  • On a map, 1 inch equals 12.9 miles. If two cities are 4.5 inches apart on the map, how far are they actually apart?
    5·1 answer
  • Use the drawing tools to form the correct answers on the graph.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!