The difference between the big and small numbers is 45, and (1/5) of the large number is equal to (1/2) of the small number. What is the sum of these two numbers?
大小两个数差45，大数的(1/5)等于小数的(1/2)，这两个数的和是多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/5) / (1/2)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">45 / (3/5)</gadget>
<output>75</output>

<gadget id="calculator">75 * (2/5)</gadget>
<output>30</output>

<gadget id="calculator">75 + 30</gadget>
<output>105</output>

<result>105</result>