$$1- \frac{3}{7}= \frac{4}{7}$$  $24\div \frac47=42$  $42-24=18$. 
$$\frac{3}{7}$$ of the passengers on the bus were adults and the rest were children. There were $$24$$ children. How many adults were there? 

  $$42$$ 
  $$30$$ 
  $$18$$ 
  $$15$$ 
  $$10$$ 