There are 45 students in class A, and the number of students in class B is 1/5 more than that of class A. The number of students in class two is equivalent to (1/2) the number of students in the whole grade. How many students are there in the whole grade?
甲班有学生45人，乙班学生人数比甲班多(1/5)，两班人数相当于全年级人数的(1/2)，全年级有多少人？
<gadget id="calculator">54 + 45</gadget>
<output>99</output>

<gadget id="calculator">99 * 2</gadget>
<output>198</output>

<result>198</result>