Beibei's body length increased by 0.1 meters when she was born on a full moon, and Beibei's body length was 0.98 meters when she was a hundred days old, which was 0.22 meters longer than when she was born on a full moon. How many meters was Beibei's body length at birth?
蓓蓓满月时体长比出生时增加了0.1米，百天时蓓蓓的体长是0.98米，比满月时增加了0.22米，蓓蓓出生的体长是多少米？
<gadget id="calculator">0.98 - 0.22 - 0.1</gadget>
<output>0.66</output>

<result>0.66</result>