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
erastovalidia [21]
3 years ago
15

The sum of Sally and Beth's age is 60. Six years ago, Sally was 3 times as old as Beth. What are their present ages?

Mathematics
1 answer:
andrew-mc [135]3 years ago
6 0
It's quite simple. Look:

Lets let S- be the age of Sally and B- can be the age of Beth

S+B=60
S-6=3(B-6)

S-6=3B-18
S=3B-18+6
S=3B-12

3B-12+B=60
4B=60+12
4B=72
B=72/4
B=18

B=60-18
B=42

The ages are (B)18 and (S)42

Hope this helps!! :)
You might be interested in
Solve the system y = -x + 7 and y = -0.5(x - 3)^2 + 8.
AlladinOne [14]

Answer:

(1,6) & (7,0)

Step-by-step explanation:

y = -x + 7

y = -0.5(x - 3)² + 8

To solve the system, solve these two equations simultaneously

-x + 7 = -0.5(x - 3)² + 8

-x + 7 = -0.5(x² - 6x + 9) + 8

-x + 7 = -0.5x² + 3x - 4.5 + 8

0.5x² - 4x + 3.5 = 0

x² - 8x + 7 = 0

x² - 7x - x + 7 = 0

x(x - 7) - (x - 7) = 0

(x - 1)(x - 7) = 0

x = 1, 7

y = -1 + 7 = 6

y = -7 + 7 = 0

(1,6) (7,0)

Since the system has two distinct solutions, the line and the curve meet at two distinct poibts9: (1,6) & (7,0)

8 0
3 years ago
Are these 2 triangles congruent? 0 If no, type "not congruent" If yes, state what postulate or theorem proves it.​
Novosadov [1.4K]

Answer:

the triangles are congruent

6 0
2 years ago
Find the sixth term of the geometric sequence when a4=−8 and r=0.5
LuckyWell [14K]

Answer:

Find the sixth term of the geometric sequence when a4=−8 and r=0.5

Step-by-step explanation:

4 0
3 years ago
Suppose there are 20 questions on a multiple choice test.if 25% of the answers are choice b how many of the answers are not choi
zvonat [6]

Answer:

are not choice b 75%

75/100 *20 = 1500/100=15

Step-by-step explanation:

6 0
3 years ago
Work out the perimeter of a quarter-circle with radius 7cm.
Flura [38]

Answer:

25

Step-by-step explanation:

p=1÷4pir+2r

1÷4×22÷7×7+2(7)

=11cm+14cm

=25

7 0
3 years ago
Read 2 more answers
Other questions:
  • What is the value after 7 years of 2014 Ford Mustang that originally cost $25,000 if it depreciates at a rate of 8% per year rou
    7·2 answers
  • The function f(x) has been transformed to give g(x). Which of the following functions represent g(x)
    13·2 answers
  • Alex bought 2 1/4 pounds of M&Ms and 1.6 pounds of gummy worms. If the M&Ms cost $2 per pound, and the gummy worms cost
    9·1 answer
  • Factor v^2-2v-35....................​
    8·1 answer
  • One question is all I need help on.
    13·1 answer
  • Ms. Bustamante collected data on how many years other teachers at school have been teaching. She collected the following data: 1
    7·2 answers
  • ¿Cuál es la factorización en primos de 10? (el formato de la espuesta es 7x7)
    10·1 answer
  • Can someone help me plz?? and if u answer it can u explain how you got the answer? thx :)
    14·1 answer
  • Quizz <br><br>hello bro i can spam like do you want<br><br>3 × 3 × 3=​
    7·2 answers
  • Find the lateral surface of the prism below
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!