Problem solving: Leann is two years younger than Rachel Rose is the same age as Luann if you add all their ages together, the sum is 29. How old is Luann?

Luann is 9 years old.

Step-by-step explanation:

Let,

x = Luann's age

y = Rachel

z = Rose

According to given statement;

x = y - 2

x = z

x + y + z = 29

Putting values

(y-2) + y + (y-2) = 29    (as z = x and x = y-2)

y -2 + y + y -2 = 29

3y - 4 = 29

3y = 29 + 4

3y = 33

Dividing both sides by 3

y = 11

Luann's age = 11 - 2 = 9 years

Thus,

Luann is 9 years old.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional