There are 28 boxes of pears, 3/4 of apples, and bananas (7/15) of pears. How many boxes of bananas did the fruit shop ship in total?
水果店里运来一批水果，其中梨有28箱，苹果的箱数是梨的(3/4)，梨的箱数是香蕉的(7/15)．水果店一共运来香蕉多少箱？
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">21 / (7/15)</gadget>
<output>45</output>

<result>45</result>