 
<translate> Rabin tarin Bernie yana nufin 18 * 0.5 = katunan gidan waya 9. Don haka ya iya sayar da katin gaisuwa 9 a kan 9 * 15 = $135. Ya yanke shawarar kashe duk kudinsa a kan sabbin katunan gaisuwa a dala 5 kowanne, don haka ya sami damar siyan 135 / 5 = sabbin katunan gaisuwa 27. Wannan yana nufin Bernie yana da 9 + 27 = 36 katunan gidan waya bayan duk. Amsar ita ce 36. <eng> Half of Bernie's collection means 18 * 0.5 = 9 postcards. So he was able to sell 9 postcards for 9 * 15 = $135. He decided to spend all of his money on new postcards for $5 each, so he was able to buy 135 / 5 = 27 new postcards. This means Bernie has 9 + 27 = 36 postcards after all. So the answer is 36. 