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

Answer:

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

Step-by-step explanation:

$77=a+k+b+c$

$b=2a$

$c=a-8$

$k=10+a$

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

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