Question 1173582

Monica is 4 years older her brother Kevin. Kevin is 9 years younger than Robert, the oldest child in the family. The sum of their ages is 37. How old are Robert, Monica, and Kevin
<pre>Let Kevin's age be K
Then Monica's is: K + 4, and Robert's is: K + 9
We then get: K + K + 4 + K + 9 = 37
3K = 24
Kevin, or {{{highlight_green(matrix(1,6, K, "is", 24/3, "=", 8, years-old))}}}
Now you should be able to find Monica's and Robert's ages.