Write R codeCreate an additional column in the data frame $($friend$)$ that results in the total ages for the three persons in each family $(=$ friend $+$ mother $+$ father$).$

Example code:

# Convert character value to numeric to add

frienddf$age $<-$ as$.$numeric$($as$.$character$($frienddf$age$))$

frienddf$momAge $<-$ as$.$numeric$($as$.$character$($frienddf$momAge$))$

frienddf$dadAge $<-$ as$.$numeric$($as$.$character$($frienddf$dadAge$))$

# Add a column for total age

frienddf$totalAge $<-$ frienddf$age $+$ frienddf$momAge $+$ frienddf$dadAge