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
olga nikolaevna [1]
3 years ago
12

Jimmy set his score for his math test. After the math teacher returnee his paper to him, he realized that if he increased his ta

rget by 10%, he would need 1 more mark to reach his actual score. If he increased his target by 15%, this target would exceed his actual test marks by 3. What is his actual test score.
Mathematics
1 answer:
mixer [17]3 years ago
8 0
When ever you have percentages, it should be helpful to bear in mind you can express them as multipliers. In this case, it will be helpful.
So, if we let:
a = test score
b = target score
then, using the information given:
a = 1.1b + 1
a = 1.15b - 3
and we get simultaneous equations.
'1.1' and '1.15' are the multipliers that I got using the percentages. Multiplying a value by 1.1 is the equivalent of increasing the value by 10%. If you multiplied it by 0.1 (which is the same as dividing by 10), you would get just 10% of the value.
Back to the simultaneous equations, we can just solve them now:
There are a number of ways to do this but I will use my preferred method:
Rearrange to express in terms of b:
a = 1.1b + 1
then b = (a - 1)/1.1
a = 1.15b - 3
then b = (a + 3)/1.15
Since they are both equal to b, they are of the same value so we can set them equal to each other and solve for a:
(a - 1)/1.1 = (a + 3)/1.15
1.15 * (a - 1) = 1.1 * (a + 3)
1.15a - 1.15 = 1.1a + 3.3
0.05a = 4.45
a = 89

You might be interested in
Is 5/8 a whole number
natita [175]

Answer: no

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Can someone help me with this. ^_^ THANKS
Fynjy0 [20]
It would be B. because it's just 7 times 1.5
4 0
3 years ago
A circle has a diameter of 12 feet. What is the circumference of the circle?
Lady bird [3.3K]

Answer:

B). 37.68 feet.

Step-by-step explanation:

Circumference = diameter *  π

= 12 * π

=  37.68 feet.

5 0
3 years ago
Write an ordered pair corresponding to the point
kap26 [50]

Answer:

(-3,-1)

Step-by-step explanation:

go back 3 for x

and down 1 for y

6 0
2 years ago
Read 2 more answers
A single die is rolled one time. Find the probability of rolling a number greater than 4 or less than 3
Tomtit [17]
You have a 2/6 chance of rolling <span>a number greater than 4 or less than 3 which reduces to 1/3
2/6 = 1/3</span>
8 0
3 years ago
Other questions:
  • A triangle abc has angle measures of 45,45 and 90 and two congruent (equal sides. How would this triangle be classified ?
    11·2 answers
  • Have to add pic dont answer
    11·1 answer
  • Slope m = -5 y= intercept -4 What is the equation?
    8·2 answers
  • 5 apples cost $7.50. Find the cost of 6 apples. please explain
    5·2 answers
  • Please help, ty if you do :D
    15·1 answer
  • Change to Slope-Intercept form (Y=MX+B) Show all your work!!!! 2x-y=2​
    11·2 answers
  • Find the mode of the data set below.
    5·2 answers
  • Sole the equation x^2=16
    12·2 answers
  • Plzz answerrrr.............................
    10·2 answers
  • True or false: Least squares regression problems always have a unique solution, since they are modelled by the normal equation
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!