What is the value of the expression 1/2 - (-1/3+2/5) ?

Which of the following statement about pascal's triangle are true?

If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

At a kentucky friend chicken, a survey showed 2/3 of all people preferred skinless chicken over the regular chicken. if 2,400 people responded to the survey, how many people preferred regular chicken?