Question

Kenneth is 10 years older than Andrew. Billy is 2 times as old as Andrew. Cameron is 8 years younger than Andrew. The combined age of the four is 77. How old is each boy?​

Answer 1

`a=15\\b=30\\c=7\\k=25`

Explanation:

`77=a+k+b+c`

`b=2a`

`c=a-8`

`k=10+a`

`77= a+2a+(a-8)+(a+10)`

`77=3a+(2a+2)\\77-2=3a+2a\\75=5a\\`