When a giant panda is full moon, its weight increases by 1105 grams compared with its birth weight, and its weight at full moon is about 7.5 times that of its birth weight. How many grams does this giant panda weigh at birth?
一只大熊猫满月时，比刚出生时的体重增加了1105克，满月时的体重大约是刚出生时的7.5倍，这只大熊猫刚出生时的体重是多少克？
<gadget id="calculator">7.5 - 1</gadget>
<output>6.5</output>

<gadget id="calculator">1_105 / 6.5</gadget>
<output>170</output>

<result>170</result>