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LUCKY_DIMON [66]
3 years ago
11

Kim's age is twice that of her sister. When you add Kim's age to her sister's age, you get 42. How old is each sister?

Mathematics
1 answer:
xz_007 [3.2K]3 years ago
7 0

Answer:

a: K = 2s

K + s = 42

b: 2s + s = 42

K = 28

s = 14

Step-by-step explanation:

1. Come up with equations based on the information given.

K = Kim

s = sister

Kim is twice of her sister -> K = 2s

When you add Kim's age to her sister's age, you get 42 -> K + s = 42

2. Substitue for K to find out the value of s

K = 2s

2s + s = 42

3. Solve for s

s = 42/3

s= 14

4. Solve for K

K = 2s

K = 2*14

K = 28

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A + c = 824                             represents number of tickets to sell
20a + 12c = 13,344                represents cost of each type of ticket

multiply equation 1 by -12 to cancel the variable 'c' and solve for 'a'

-12(a + c = 824)

-12a - 12c = - 9888
 20a + 12c = 13,344         add equations together
-----------------------------
    8a          = 3456           divide both sides by 8
     a = 432

To find children's tickets substitute adult numbers back into equation 1.
a + c = 824
432 + c = 824
subtract 432 from both sides
c = 392

adult 432, children 392
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6 0
3 years ago
Need to solve for Y by filling in the blanks<br>(y +44)°, 86, (3y)°​
lapo4ka [179]
Answer:

1.89

Solution:

We have -44x - 86 = -3

First, we move the non x terms to the RHS of the equation. To do this, we add 86 to both sides.

Note: if a = b, then a + c = b + c
Therefore, -44x - 86 + 86 = -3 + 86

or, -44x = 83

Next, divide both sides by -44, which is the coefficent of x

Note: if a = b, then a ÷ c = b ÷ c
-44x
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=
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or, x = -1.89


Explaination:

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4 0
2 years ago
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Galina-37 [17]

Answer:

3 727/1000

Step-by-step explanation:

First, the ones place is 3, so we already know that

Also, there is a 0.727.

There are 3 decimal spaces, so that means thousandths

So, its 3 727/1000

4 0
3 years ago
Read 2 more answers
What is the root of the equation 2x + 10 = f(x)?
Korolek [52]

Answer:

x=-5

Step-by-step explanation:

2x+10=0

2x=-10

x=-5

5 0
2 years ago
Read 2 more answers
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