The ratio of the amount of money carried by A and B is 7:3. After A gives B 5 yuan, it becomes 13:7. So, how much money do A and B have in total?
甲、乙两人身上带的钱数之比是7：3，甲给乙5元后，变成13：7．那么，甲、乙两人共有钱多少元．
<gadget id="calculator">7 + 3</gadget>
<output>10</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">13 + 7</gadget>
<output>20</output>

<gadget id="calculator">13 / 20</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">(7/10) - (13/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">5 / (1/20)</gadget>
<output>100</output>

<result>100</result>