Answered

Any smart people out there, i really suck at these problems... Five times Lauren's age, decreased by 2 is equal to two times Lauren's age, increased by 11. How old is Lauren?

Verified Answer :

PhyCS

Set Lauren's age equal to L.


Using what the problem gave us, we can quickly set up an equation: 

5L - 2 = 2L

Solving this equation, we get 3L = 2. L = 2/3 Lauren is 2/3 of a year old.

AL2006


Take it slowly, one step at a time.

First, you need to pick something to call "Lauren's age",
because you don't know what number it is.  I have a bright idea ! 
Let's call Lauren's age ' L ' !  OK ?

Use ' L ' to build the quantities discussed in the question:

Five times Lauren's age . . . . . . . . . . . . . . . . . 5 L
Five times Lauren's age, decreased by 2 . . . 5L - 2

Two times Lauren's age . . . . . . . . . . . . . . . . .  2 L
Two times Lauren's age, increased by 11 . . . 2L + 11

The question says that these 2 quantities are equal,
so write that down:
                                                      5L - 2  =  2L + 11

Add  2  to each side:                  5L        =  2L + 13

Subtract  2L  from each side:    3L        =           13

Divide each side by  3 :                L        =           13/3  or  4 and 1/3 .

That's certainly a weird number, but you can
check it out, and you'll find that it's true:

Lauren's age . . . . . 13/3

Five times Lauren's age . . . . . . . . . . . . . . . . . 65/3
Five times Lauren's age, decreased by 2 . . . 59/3    <===

Two times Lauren's age . . . . . . . . . . . . . . . . .  26/3
Two times Lauren's age, increased by 11 . . . 59/3    <===

Those 2 quantities are equal.  So Lauren is 4-1/3 years old, by golly !