Xiaoming asked Xiaohong: "How old are you this year?" Xiaohong said: "Guess, my grandpa is 70 years old this year, and in five years, my age will be exactly (1/5) of grandpa's." Forget it, how old is Xiaohong?
小明问小红："你今年多大了？"小红说："你来猜一猜，我爷爷今年70岁，再过5年，我的年龄正好是爷爷的(1/5)．"算一算，小红今年几岁？
<gadget id="calculator">70 + 5</gadget>
<output>75</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">75 * (1/5)</gadget>
<output>15</output>

<gadget id="calculator">15 - 5</gadget>
<output>10</output>

<result>10</result>