Question

The variable Z is directly proportional to X. when X is 15, Z has the value of 45. what is the value of Z when X=23

Answer 1

`If\ Z\ is\ directly\ proportional\ to\ X\ then\ (Z)/(X)=const.\\------------------------\\X=15\ and\ Z=45\\\\X=23\ and\ Z=?\\\\(Z)/(23)=(45)/(15)\to(Z)/(23)=3\ \ \ \ |multiply\ both\ sides\ by\ 23\\\\\huge\boxed{Z=69}`