If a + b = 33, and a - b = 37, find the value of (a + b)2.
Jitesh and Kamal can complete a certain piece of work in 5 and 18 days, respectively. They started to work together, and after 3 days, Kamal left. In how many days will Jitesh complete the remaining work?
\( \frac{11}{6} \)
\( \frac{13}{6} \)
\( \frac{7}{6} \)
\( \frac{25}{6} \)