It is known that a:5=6:b, then what is the value of ab+7.
已知a：5=6：b，那么ab+7的值是多少．
<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">30 + 7</gadget>
<output>37</output>

<result>37</result>