A two-digit number, plus 9 times its one-digit number, is exactly equal to 100. What is three-fifths of the sum of the digits of this two-digit number?
一个两位数，加上它的个位数字的9倍，恰好等于100．这个两位数的各位数字之和的五分之三是多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">10 * (3/5)</gadget>
<output>6</output>

<result>6</result>