Xiao Ming is 15 years old this year, and his grandma is 3 years younger than Xiao Ming's five times. How old is grandma this year?
小明今年15岁，奶奶的年龄比小明的5倍少3岁，奶奶今年多少岁？
<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<gadget id="calculator">75 - 3</gadget>
<output>72</output>

<result>72</result>