Question 1099711
How would I solve the following problem?  Mary is five years older than Sue. Twenty years ago, Sue was half as old as Mary is now. How old is Mary now?
<pre>You're seeking to find MARY'S age, so let MARY'S age be M
Then Sue's is: M - 5
We then get: {{{matrix(1,3, M - 5 - 20, "=", (1/2) * M)}}}
{{{matrix(1,3, M - 25, "=", M/2)}}}
2M - 50 = M ------- Multiplying by LCD, 2
- 50 = M - 2M
Mary, or {{{highlight_green(matrix(1,6, M, "=", (- 50)/(- 1), "=", 50, years-old))}}}
IGNORE anyone who says otherwise!