Can someone help me understand how you get these answers?

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

When steve woke up. his temperature was 102 degrees f. two hours later it was 3 degrees lower. what was his temperature then?