The grain store shipped (4/9) tons of rice, and the number of tons of flour shipped was (3/4) that of rice. What is the total number of tons of rice and flour shipped?
粮店运来(4/9)吨大米，运来的面粉的吨数是大米的(3/4)，运来大米和面粉一共多少吨．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/9) * (3/4)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(4/9) + (1/3)</gadget>
<output>7/9 = around 0.777778</output>

<result>7/9 = around 0.777778</result>