Xiao Ming's weight is 25kg, and his father's weight is 2.8 times that of Xiao Ming's, and 1.4 times that of his grandfather. How much does grandpa weigh?
小明的体重是25kg，爸爸的体重是小明的2.8倍，是爷爷的1.4倍．爷爷的体重是多少㎏？
<gadget id="calculator">2.8 / 1.4</gadget>
<output>2</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<result>50</result>