Bertha has 6 daughters and no sons. Some of her daughters have 6 daughters and the rest have none. Bertha has a total of 30 daughters and granddaughters, and no great-grand daughters. How many of Bertha's daughters and granddaughters have no daughters?
<spanclass=′latex−bold′>(A)</span>22<spanclass=′latex−bold′>(B)</span>23<spanclass=′latex−bold′>(C)</span>24<spanclass=′latex−bold′>(D)</span>25<spanclass=′latex−bold′>(E)</span>26