Let there be $$g$$ girls in Pip\textquotesingle s school. Then there are $$(g-30)$$ boys at the school. So $$g+g-30=600$$. Therefore $$2g=630$$, that is $$g=315$$. 
There are $$600$$ pupils in Pip\textquotesingle s school, with $$30$$ more girls than boys. How many girls are at Pip\textquotesingle s school? 
Options:
  $$270$$ 
  $$300$$ 
  $$315$$ 
  $$330$$ 
  $$345$$ 