Question 1155563

Mary is 16 years older than David, David is 13 years younger than Charlie. If the sum of their ages is 62, how old is Mary?
<pre>Let Mary's age be M
Then David's is: M - 16, and Charlie's is: M - 16 + 13. or M - 3
Since all ages sum to 62, we get: M + M - 16 + M - 3 = 62
3M = 81
M, or Mary is: {{{highlight_green(matrix(1,4, 81/3, "=", 27, years-old))}}}