number is multiplied by 39 and 61 respectively, and the results are added together to get 3800. What is this number?
一个数分别与39和61相乘，再把结果相加，得3800，这个数是多少．
<gadget id="calculator">61 + 39</gadget>
<output>100</output>

<gadget id="calculator">3_800 / 100</gadget>
<output>38</output>

<result>38</result>