The school library bought 456 new art books, and bought 20 more science books than four times the art books. How many science books were bought?
学校图书馆新买美术书456本，买科技书的本数比美术书的4倍还多20本，买来科技书多少本？
<gadget id="calculator">456 * 4</gadget>
<output>1_824</output>

<gadget id="calculator">1_824 + 20</gadget>
<output>1_844</output>

<result>1_844</result>