There is a piece of copper-tin alloy. If the copper is increased (1/8), the weight of the alloy will reach 880 grams. If the tin is reduced by 12.5%, the weight of the alloy will be 780 grams. How many grams does this alloy weigh?
有一块铜锡合金，如果增加铜的(1/8)，合金重量将达到880克，若将锡减少12.5%，合金重量是780克，这块合金重多少克？
<gadget id="calculator">880 - 780</gadget>
<output>100</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">100 / (1/8)</gadget>
<output>800</output>

<result>800</result>