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
katrin [286]
3 years ago
7

In a science test. Devi scores 16 marks more than Ali. lf

Mathematics
1 answer:
sergeinik [125]3 years ago
3 0

Let the marks of Devi be x and Ali be y.

So, the equations:

2y = x <em>and</em> y + 16 = x

So,

2y = y + 16. [ because we know equals are equal to equals]

=> 2y - y = 16

=> y = 16

Check

Ali's marks are half of Devi's marks.

Devi's marks are 16 more than alis.

So, Devi's marks will be 16×2 = 32 and 32 is 16 greater than 16 (16+16=32).

You might be interested in
-7x-6y=-1
Xelga [282]
Cancel something
we cancel x's

multiply 1st equation by 5 and 2nd by 7 and add them
-35x-30y=-5
<u>35x-28y=7 +</u>
0x-58y=2

-58y=2
divide both sides by -58
y=-1/29
sub back
5x-4(-1/29)=1
5x+4/29=1
minus 4/29 from both sides
note, 1=29/29
5x=25/29
divide bot sides by 5 (or times 1/5)
x=5/29


(5/29,-1/29)
6 0
3 years ago
At a team meeting, 80% of the tennis team was there. If there were 12
Illusion [34]

Answer:

15 people

Step-by-step explanation:

let x=total # of people on the team

80%=12

80/100=12/x

cross multiply

80x=1200

division property of equality (divide both sides by 80)

x=15

There are 15 people on the team.

8 0
3 years ago
21. 13/4 x 42/9 =<br> O<br> A. 132/18<br> B. 64/9<br> O<br> C. 77/18<br> D. 41/6<br> Worth 2 points
ANTONII [103]
Hi! 13/4 X 42/9 = 91/6 or 91/6 ls there any other options to choose from?
4 0
3 years ago
Factor 2x^2-4x-30 completely
Elza [17]
2x² - 4x - 30
2(x²) - 2(4x) - 2(15)
2(x² - 4x - 15)
4 0
3 years ago
What is the best estimate for 1,468
Vanyuwa [196]
The answer would be 1,500 because 68 is higher than 50 so it will round up to 1,500.

3 0
3 years ago
Other questions:
  • Answer the question.
    7·1 answer
  • Which quadrilaterals have diagonals that are not lines of symmetry?
    6·1 answer
  • X= 3 - 61<br> What are the real and imaginary parts of : ?
    13·1 answer
  • Please somone helppppp
    14·2 answers
  • Write 0.0003315 in scientific notation.
    5·1 answer
  • Solve the inequality.
    8·2 answers
  • Can u guys please help me fast i only got 30 mins question is
    10·2 answers
  • If Johnny caught 2 out of 5 catfish on his first fishing trip how many catfish can he expect to catch if he caught a total of 60
    6·2 answers
  • A new compact car can travel 288 miles is a nine gallons of gas. The distance driven in miles y varies directly with the number
    12·1 answer
  • Find sin j? Please I don’t understand
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!