Part/Whole=Percent/100 Part=18 Percent=45 Whole= a variable that we are trying to figure out so now its 18/x=45/100 Cross multiply and get 45x=1800 Divide by 45 and get 40. 18 is 45%of 40
if she had 10 left at the end and you add the other half from lunch which is 12, then that gives you 22. Since before lunch she had half (22), all you gotta do is add the other half which is 22. 22+22=44 and that's your answer.
