Mom took Xiao Min to buy cloth. If the money mother brings is 1.80 yuan left after buying 2 meters of cloth; if she buys the same cloth of 4 meters, the difference is 2.40 yuan, so how much money did mother bring?
妈妈带小敏去买布．妈妈带的钱如果买2米布后还剩1.80元；如果买同样的布4米，则差2.40元，那么妈妈带了多少元钱？
<gadget id="calculator">1.8 + 2.4</gadget>
<output>4.2</output>

<gadget id="calculator">4 - 2</gadget>
<output>2</output>

<gadget id="calculator">4.2 / 2</gadget>
<output>2.1</output>

<gadget id="calculator">2.1 * 2</gadget>
<output>4.2</output>

<gadget id="calculator">4.2 + 1.8</gadget>
<output>6</output>

<result>6</result>