Mr. Zhang collected some pictures, among which the pictures of famous mountains accounted for 45%, and the pictures of rivers accounted for 15%. There were 60 more pictures of famous mountains than pictures of rivers. How many pictures did Mr. Zhang collect in total?
张老师收集了一些图片，其中名山图片占45%，河流图片占15%，名山图片比河流图片多60张，张老师共收集了多少张图片？
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(9/20) - (3/20)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">60 / (3/10)</gadget>
<output>200</output>

<result>200</result>