There are 45 goats on the hillside, and the number of sheep is twice as many as that of goats. How many sheep are there? (Draw a line segment diagram and mark the middle problem parallel calculation)
山坡上有山羊45只，绵羊的只数比山羊多2倍，绵羊有多少只？(画线段图，标出中间问题并列式计算)
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">45 * 3</gadget>
<output>135</output>

<result>135</result>