Question 895240
Hi,
My math teacher (at school) and I have a conflict on the following specific problems.  I would appreciate if you can provide your input on this.  We just need to identify the equations in each case:

Let Bob's age (in years) now = B
Let his Sister's age (in years) now = S
Let his Brother's age (in years) now = R

Problem 1: In three years, Bob will be five years older than his sister will be.  How old is his sister?
S = ?

Problem 2: In three years, Bob will be twice as old as his brother will be.  How old is his brother?
R = ?
<pre>
<u>Problem 1</u>	
B = S + 5_____S = B – 5. 
It doesn’t matter which year we're talking about. Starting from his sister's birth year, Bob was 5 years 
older than her, so his age will ALWAYS be S + 5, and her age will ALWAYS BE represented by: {{{highlight_green(highlight_green(S = B - 5))}}}  
<u>Problem 2:</u>
B + 3 = 2(R + 3)
B + 3 = 2R + 6
B + 3 – 6 = 2R
B – 3 = 2R
{{{highlight_green(highlight_green(R = (B - 3)/2))}}}