After subtracting 15 from Xiaole’s age this year, divide by 4, and then subtract 6, then multiply by 10, which is exactly 100. Q: How old is Grandpa Xiaole?
小乐爷爷今年的年龄数减去15后，除以4，再减去6之后，乘以10，恰好是100．问：小乐爷爷今年多少岁？
<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<gadget id="calculator">10 + 6</gadget>
<output>16</output>

<gadget id="calculator">16 * 4</gadget>
<output>64</output>

<gadget id="calculator">64 + 15</gadget>
<output>79</output>

<result>79</result>