There are two numbers a and b, if the number b increases by 5, it is equal to the number a, and at this time the product of the two numbers is 74 more than the product of the original two numbers, what is the original value of b?
有a、b两数，如果b数增加5，则与a数相等，且此时两数的积比原来两数的积多74，b原来是多少．
<gadget id="calculator">74 / 5</gadget>
<output>74/5 = around 14.8</output>

<gadget id="calculator">(74/5) - 5</gadget>
<output>49/5 = around 9.8</output>

<result>49/5 = around 9.8</result>