Xiaohua especially likes cell phone pictures. She collected 50% pictures of famous mountains and 30% pictures of rivers. There were 40 more pictures of famous mountains than pictures of rivers. How many pictures did she collect in total?
小华特别喜欢手机图片．她收集的名山图片占50%，河流图片占30%，名山图片比河流图片多40张，一共收集了多少张图片？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(1/2) - (3/10)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 / (1/5)</gadget>
<output>200</output>

<result>200</result>