A, B and C collect stamps. A has 48 more stamps than B, the ratio of the number of stamps of B to C is 7:5, the ratio of the sum of the number of stamps of B and C to the number of stamps of A is 6:5. How many stamps does C have.
A、B与C三人集邮．A比B多48张邮票，B与C的邮票张数的比是7：5，B和C的邮票张数之和与A的邮票张数的比是6：5．C有多少张邮票．
<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(6/5) * 48</gadget>
<output>288/5 = around 57.6</output>

<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">(6/5) * (7/5)</gadget>
<output>42/25 = around 1.68</output>

<gadget id="calculator">1 - (42/25)</gadget>
<output>-17/25 = around -0.68</output>

<gadget id="calculator">(7/5) + (-17/25)</gadget>
<output>18/25 = around 0.72</output>

<gadget id="calculator">(288/5) / (18/25)</gadget>
<output>80</output>

<result>80</result>