title: How to scale x axis and add ticks in R
body: <p>I build an Histogram in R using geom_histogram, I want to scale my x axis up to 155 insted of 252 that is showing and to see a tick evrey 5 numbers (0,5,10 etc), I used the <code>scale_x_continuous(breaks=(0,155,5)</code>. it worked but the histogram is not presented all across the screen.
  I used <code>xlim(0,155)</code> it showed the histogram all across the screen but it override the ticks I defined.</p>