The school distributes 105 science and technology books to the fifth and sixth grades at a ratio of 4:3. How many books are assigned to the fifth grade?
学校把105本科技书按4：3分配给五、六年级．五年级分到多少本．
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">105 * (4/7)</gadget>
<output>60</output>

<result>60</result>