Problem 15

$$\begin{array}{lcl} 15.\;Mathplanet\;School\;has\;y\;students\;equally\;divided\;\\ among\;x\;classes.\;The\;school\;wants\;to\;order\;enough\;\\ mathbooks\;so\;that\;each\;student\;will\;have\;a\;book\;and\\ each\;class\;will\;have\;2\;extra\;books.\;How\;many\;books\\ does\;the\;school\;need\;to\;order?\\ \\ (A)\; y+x\\ (B)\; y+2+x\\ (C)\; yx+2\\ (D)\; y+2x\\ (E)\; y(2+x)\\ \end{array}$$