(2/5) of a number is 1 less than the largest two-digit number, find this number (use equation solution)
一个数的(2/5)比最大的两位数小1，求这个数(用方程解)
<gadget id="calculator">99 - 1</gadget>
<output>98</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">98 * (5/2)</gadget>
<output>245</output>

<result>245</result>