Donald Duck Farm has 350 chickens, 30 less than ducks (2/3), how many ducks are raised in Donald Duck Farm? (solution by equation)
唐老鸭农场养了鸡350只，比鸭的(2/3)少30只，唐老鸭农场养鸭多少只？(用方程解)
<gadget id="calculator">30 + 350</gadget>
<output>380</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">380 / (2/3)</gadget>
<output>570</output>

<result>570</result>