The baby weighs 3.25 kg at birth, and grows to 7 kg after 3 months. How many kg does the baby grow on average every month? How many formulas
宝宝刚出生时体重3.25千克，3个月以后长到7千克，宝宝平均每个月增长多少千克？算式多少
<gadget id="calculator">7 - 3.25</gadget>
<output>3.75</output>

<gadget id="calculator">3.75 / 3</gadget>
<output>1.25</output>

<result>1.25</result>