Question 1091284

my brother is half as old as i am. my sister is twice as old as i am. the sum of our ages is 35. how old am i? 
<pre>Let my age be M
Then my brother's age is: {{{matrix(1,5, (1/2), of, "M,", or, M/2)}}} 
Sister's age: 2M
We then get: {{{matrix(1,3, M + M/2 + 2M = 35, "=======>", 3M + M/2 = 35)}}}
6M + M = 70 ------ Multiplying by LCD, 2
7M = 70
M, or my age = {{{highlight_green(matrix(1,3, 70/7, "=", 10))}}}